proportionality must be learned. See the TACH CALIBRATION procedure for details, using meter set-
ting 0 to force learning.
SPECIAL SCALING FUNCTIONS
Several Proparts meters require a setup procedure to define the kind of input they are looking at.
These are:
Tachometer
– the user needs to tell it the number of “pulses per revolution” (PPR) coming into its
sense line. This number varies widely between makes and models of cars. The default value is an
eight cylinder engine with 4 PPR. The program setting is 4000RPM.
Speedometer
– the user needs to tell it the number of pulses that come in, per mile of travel.
O2 sensor
– the user needs to tell it whether the sensor is narrowband (with a 0-1 volt output) or a
wideband sensor with a 0...5 volt output Once the meter is hooked up, the procedures are relatively
painless.
TO SET UP SCALING
Turn the ignition off and on again to assure that the meter is in a reset state.
If it starts up with the face changing color and the pointer going up and down continuously, the meter
is in demo mode. Press the center button before continuing.
TACH CALIBRATION
First read the section on TACHOMETER SENSE LINE ATTACHMENTS AND METER SCALING in order to
find out how you need to set the meter. When you have figured out what PPR setting you are to use,
press the Mode and Up buttons simultaneously for five (5) seconds. The dial will flash blue rapidly.
This places the meter in the scale-setting mode. Use the Down and Up buttons to move the meter
pointer to the appropriate RPM reading according to the table. If you have selected an “RPM” reading
of 1000 or up, just press the center button to leave the scale setting mode and resume normal
operation with the selected scaling.
If you were forced to use the alternator as a signal source, you selected an RPM of “0.” Now you must
tell the motor when it is operating at 2000 RPM. Using a strobe light, slowly increase the engin
speed till you hit 2000 RPM. The meter will read some nonzero value that increases and decreases
with engine speed, but it will not be accurate. While the engine is running steadily at 2000 RPM, press
the mode button. Your meter is calibrated. You can verify the setting by turning the ignition switch off
and on again, starting the car, and checking whether the idle speed on your tachometer is the same as
the speed you measure with a strobe light.
Programming Instructions for : RPM Tachometer
2
1/16
” Controller
9
U.S. PATENT # 7,612,660
U.S. PATENT # 7,278,749
ADDITIONAL PATENTS PENDING
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