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Motorcycle/Scooter Computer 

   MD-052-2XX/3XX User Manual

Thanks for purchasing the Motorcycle/Scooter computer. 

The user manual is designed for MD-052-2XX and MD-052-3XX series, 

functions and descriptions with “ ** ” are for MD-052-2XX only, functions 

and descriptions with “  *  ” are for MD-052-3XX only. 

Different LED combinations have different model numbers. You may find 

the above photo has different LED indicators from your computer; the photo 

above is for reference only.  

1. Tachometer Scale 

2. Bar Tachometer 
3. Speed & MAX speed  
4. Other functions display 
5. Push Button

PANEL DESCRIPTIONS

FEATURES

SPECIFICATIONS

FUNCTIONS

Multi-functional LCD Motorcycle/Scooter computer displays speedometer, 

bar-graphic tachometer,  ** fuel gauge or  * temperature gauge, and one of 

other function simultaneously. 

Integrates backlight and 6 LED lights for different purpose indicators.

Built-in bar-graphic and digital tachometers and resettable shift warning 

indicator.  

On some models the backlight can be controlled separately from the ignition 

power.

Allows end user to adjust odometer when the odometer is less than 30km / 

18.6 miles

Fast processor so can connect to pulse type gearbox speed sensors. 

**Fuel gauge in/-100Ω, 250Ω and 510 Ω options for fuel meter input 

resistance, as well as “fuel gauge off” mode. 

*MD-052-3XX series includes a temperature sensor for temperature gauge. 

Odometer and total riding timer are stored in memory, even when the power 

is off.

Universal wheel circumference setting from 1mm to 3999mm. 

Includes speed sensor, magnet, RPM sensing wire, fitting kit, wiring harness 

and *temperature sensor.

Excellent water resistant, anti-vibration structure and noise immunity design. 

Power Input 

                 DC 8-18V

Speed Sensor 

                 Reed or 2 wires Hall-effect Sensor

Tachometer input 

                 CDI or Ignition Coil Signal

Wheel circumference setting 

1mm-3999mm (1mm increment)

Temperature sensor                     PT1/8” thermistor sensor

Dimensions 

                 Ø52*45.1mm

Operation Temperature:               -20°C - +80°C (inner temperature)

Storage Temperature:                   -30°C - +85°C (Inner temperature)

Functions

Symbol

Specifications

MD52-2XX MD52-3XX

Bar tachometer

Digital Tachometer 

Max. RPM 

Speedometer

Trip Meter 

Odometer

Maximum Speed

Average Speed

12/24 Hour Clock

Total Hour Meter

Riding Timer

Total Riding Timer

**Bar-Fuel meter

Volt meter  

*Temperature meter

*MAX Temperature

*Bar Temperature meter

12,000 rpm, 
100-19,900 rpm, 100rpm increment 
100-19,900 rpm, 100rpm increment 
2.4-300.0 km/h (187.5MPH)
0.0-999.9 KM/Miles
0 - 999999 KM, 0-624999 Miles
2.4-300.0 KM/h (187.5 MPH),
2.4-300.0 KM/h (187.5 MPH),
0:00’00” – 11H59’59”/23H59’59”
0-9999H59’
0-99H59`59``
0-9999H59’,

1-7 bars, +/-100, 250, 510Ω and off mode

8-18VDC
0 °

C

-180

 

°

C

 / 32 °

F

-356 °

F

0 °

C

-180

 

°

C

 / 32 °

F

-356 °

F

1-7 bars and Off mode.

RT

HRTT

TT

RPM

MAX RPM

ODO

TRIP

MAX
AVG

V

Km/h / MPH

 MAX °C or °F

°C or °F

Fuel Bar

    7

    6

    5

    4

    3

    2

    1

0-Flash

100Ω

0~10

11~20

21~35

36~45

46~60

61~75

76~90

91~100

250Ω

0~25

26~50

51~85

86~110

111~150

151~200

201~230

231~250

510Ω

0~50

51~100

101~180

181~230

231~300

301~380

381~460

461~510

-100Ω

100~90

89~75

74~60

59~45

44~35

34~20

19~10

  9~0

 

-250Ω

250~230

229~200

199~150

149~110

109~85

 84~50

 49~25

  24~0

 

-510Ω

510~460

459~380

379~300

299~230

229~180

179~100

 99~50

  49~0

        : Bar Graphic Tachometer

1. The bar graphic tachometer is always displayed.

2. It displays bar graphic tachometer up to 12,000RPM.

RPM: Digital Tachometer

 

1. It displays digital tachometer up to 19,900RPM and displays 

    19,999rpm when tachometer is over 20,000rpm.

2. Tachometer signal can pick up from either CDI or Sparking plug we 

    suggest to circle round 2-5 turns on CDI or Plug cable. 

3. It has 2 wires to pick up RPM signal, the yellow wire is to connect to 

    Plug, and blue wire is for signal from ECU or Ignition coil, only use 1 

    of the wires. 

Shift Warning RPM

1. The function enables you to set up a shift warning RPM.

2. Bar-graphic tachometer flashes when RPM reaches setting value, 

    and stop flash after you shift gear.

MAX RPM: Maximum Tachometer

1. MAX RPM is displayed at the 2nd row.  

2. Displays highest tachometer achieved after last Reset operation.

SPD: Speed Meter

1. Speed meter display is at the 1st row of the screen  

2. Displays speed meter up to 300.0 Km/H or 187.5 mph.  

MAX Km/h or MPH: Maximum Speed Meter

1. MAX is displayed at the 1st row.  

2. Displays highest speed achieved after last Reset operation.

AVG: Average Speed Meter

1. AVG is displayed at the 1st row.  

2. It calculates average speed from last RESET. The AVG is calculated   

    from TRIP be divided by RT.

TRIP: Trip Meter

1. TRIP function accumulates trip distance from last RESET as long as 

    bike is being ridden.

2. Display is on the 2nd row of screen.

ODO: Odometer

1. ODO accumulates total distance traveled. 

2. ODO data is adjustable when it is less than 30km (18.6 Miles), after 

    that it stored in memory and cannot be reset. 

HRTT: Total Hour Meter

1. Calculates total engine operation time since installation. 

2. Counting automatically begins with engine starting.

3. HRT data is stored in memory, and cannot be reset.

RT: Riding Timer

1. Calculates total operation time since last RESET operation.

2. Counting automatically begins with movement.

TT: Total Riding Timer

1. Calculates total operation time since installation.

2. Counting automatically begins with movement.

3. TT data is stored in memory, even when the power is off. 

         

: 12/24 hour Clock

1.Displays 12 or 24hour current time. 

**      

: Fuel Meter (Only for MD-052-2XX series)

1. Has 7 bars to indicate how much fuel remains.

2. Built-in 100, 250, 510Ohm, oFF, -100, -250 and -510Ωfuel sender 

    resistance, the fuel bars will disappear when you select “oFF” mode.    

3. The full bars are low resistance and empty bar is high resistance for 
    100, 250 and 510ohm; -100, -250 and -510 ohm are the inverse. 
4. Last bar and LED flash to indicate low fuel level

7. Shift warning indicator
8. Indicator of  ** low fuel or *over 

    temperature
9. LED indicators

6.  ** Fuel bar or  *Thermo meter

*

INSTALLATION & PARTS

* ˚C or ˚F: Temperature Meter 

1. It measures and displays from 0

 to 180

 (32

-356

). 

2. It displays -L-

 or -L-

 when temperature is lower than 0

 or disconnected 

    temperature sensor, and displays -H-

 or –H-

 when temperature is over 

    180

 or 356

.

3. The bar-temperature and digits of temperature and temperature LED 

    indicator flash when the thermo sensor detects temperature higher than the

    maximum preset temperature.  

4. The 4th bar of the temp bar chart counting from the bottom turns on when 

    temperature reaches the preset warning temperature, each +/-15

 

 lights 

    on/off a bar based on the 4th bar.

Speed decimal option:

1.User can decide to display speed to 1 or 0.1 mph / km/h.

2.Follow the item 10 of set up mode to option the decimal of speedometer.

V: Digital Voltage Gauge

It checks bike’s battery and charging systems health and displays battery / 

charging voltage. 

*MAX ˚C or ˚F: Maximum Temperature 

 

1. It displays at the 1st row of LCD.

2. Displays highest temperature achieved since last Reset operation.

Main Unit Installation:

Spring Washer

Washer

Rubber Pad

Bracket

Fixing Screw Nut

Main Unit

RPM sensor mounting: RPM Input, 

1.Connect either the yellow or white wire to sense the RPM signal. 

2.The yellow wire can be wrapped around the spark plug lead. 

   a.Signal intensity from ignition coil is dependent on vehicle type.

   b.Coil 2-5 turns around spark plug lead, with more turns creating 

       steadily stronger signal, fewer turns creating weaker signal.

3.If the yellow wire be wrapped around the spark plug lead works not 

   stable, please try to connect the white wire to either the ECU rev 

   counter output or to the primary side of the coil.

Speed Sensor Mounting:

ACEWELL has several speed sensors; the unit may include one of 

them. If the model is intended to be connected to a gearbox 

electronic speed output to obtain the speed reading, no speed 

sensor will be included

Reed Speed Sensor and Magnet:

 

1. This sensor is universal sensor for motorcycle, find a rotating  

     part to install magnet (for example disk, sprocket or 

     driveshaft) and a location to install the sensor where it can be 

     aligned to the magnet.  

2. Align the center of the magnet to either of the sensor marking 

    lines or the end of the sensor. The magnet must not travel 

    down the body of the sensor

Hall Effective Speed Sensor and Magnet: 

1. This is universal sensor for ATV or motorcycle front or rear wheel 

     installation. For some fitments an accessory speed sensor holder may 

     need to be purchased.

2. Find a rotating part to install magnet (for example disk, sprocket or  

     driveshaft) and a location to install the sensor where it can be aligned 

     to the magnet 

3. Align the center of the magnet to center of side face of the sensor. 

4. Make sure the gap between the magnet and the sensor is within 5mm.

Max. 8mm

Vibration Direction

sensor

Max. 8mm

Vibration Direction

sensor

Specific Hall sensors:   

Cable drive adaptors for most bikes originally fitted with cable 

driven speedometers or odometers are available. When using 

these cables it is necessary to divide the circumference setting by 

the number of rotations of the cable per rotation of the wheel.
*Thermo Sensor and Sensor Tube:

 

1. The unit includes a water temperature sensor; you may have to   

    purchase a suitable water pipe temperature sensor tube to install 

    the sensor on some bikes. 

2. Cut the water pipe, insert the temperature tube into the pipe and 

    secure it by attached pipe clamps.

3. Screw the sensor into the tube.  

4. If your vehicle is fitted with a thermostat that stops water 

     flowing to the radiator when the engine is cold, you will not get a   

     reading until the thermostat opens.

5. Custom sensors are available for carbureted bikes to replace the 

    original sensor. 

3. Installing the sensor parallel to the vibration direction creates 

    optional anti-vibration effect. 

4. Make sure the gap between the magnet and the sensor is 

    within 8mm. 

10R-0312653

Left direction indicator/Green
Main-beam headlamp/Blue
Right direction indicator/Green
Hazard Warning/ Red
Parking/Green
Direction indicator/Green

Engine oil / Red
Neutral Gear /Green
Reverse Gear /Red
Drive Gear /Green
Engine coolant temperature/ Red

P

D

R

N

Rear fog lamp/Amber

Flash Trailer/Green

Engine in out of use/ Red

20171123

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