LongacreRacing.com
LIT-5241 REV A
Longacre Racing Products
977 Hyrock Blvd.
Boonville, IN 47601
800-423-3110
ACCUTECH DLI TACH
INSTRUCTIONS
On the back of the tach, there are 2 sets of wires coming out, 1 with green, brown, black, & red - see below. There is a
second pair - red and black - in a black casing. These are for the remote Start/Stop switch.
Green wire
- to “Tach” output on ignition box or to positive side of coil on non-electronic systems.
NEVER
connect directly
to high voltage!
Black wire
- to ground. Be sure it is connected to a solid ground. Many problems are caused by a poor ground.
Brown wire -
Power (connect so it shuts off with ignition off).
Red wire
- Power (connect so it has power full time - NOT shut off when ignition is shut off).
Red & Black wires in Black casing for remote Start/Stop switch
These are for the remote Stop/Start switch. Mount where the driver can easily access it. Use a 15/32” or 1/2” drilled hole.
Cut the wire to the length needed. You can use the mini connector included or hardwire the switch directly.
To recall maximum RPM:
Push Recall button on lower left side. The pointer will recall highest RPM & hold that number and will also display on the
LCD to 10 RPM. MAX shows on LCD - lower left corner. Push again to resume normal tach operation.
Note: You can push Recall before going on the track and the tach will constantly display the highest RPM reached to that
point without pushing Recall again. It does not show active RPM once RPM drops below highest point. Push Recall to
resume normal tach operation. This way the driver can see the max RPM without pushing buttons.
To reset - erase max RPM:
Push Reset button and hold 3 seconds to erase old RPM. LCD and pointer go to current reading.
System Requirements:
Tach works ONLY on negative ground systems at a MAXIMUM of 18 volts. Anything over this may damage the tach.
Cars with 16 volt alternators and batteries may need to use a resistor on both red and brown wires.
Remote Stop/Start switch:
This red button switch is used by the driver to start and stop the recording (data logging) process. Mount where the driver
can easily access it.
