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12
Digital Tachometer w/ Shift Light Installation Instructions
Wire Color Code
Red:
12v Ignition Source (+) (switched)
Green:
Connects to Vehicle’s Tachometer Source
Black:
Vehicle Ground (-)
1. Disconnect the negative battery cable.
Connecting the Power Wire Harness
2. Connect the green wire to the vehicle’s tachometer
source wire. You must consult your manual to ensure
proper connection. If connecting to an aftermarket ignition
system, be sure to follow the manufacturer’s instructions
for connecting a tachometer. Please consult a service
manual or mechanic before installing.
Tachometer Test Wire: Some vehicles may have
a tachometer test port or wire to obtain a
tachometer signal from. Consult your owner’s
manual, dealer or licensed mechanic to confirm.
Tachometer Adapter: It is required that you
install a Tachometer Adapter if you have a multiple
coil system. You can purchase a Tachometer
Adapter from local auto parts store.
Tachometer Filter: It may be necessary to use a
Tachometer Filter if you vehicle has an points style
ignition system. You can purchase a Tachometer
Filter from www.GlowShift.com or an Authorized
Dealer.
3. Using automotive grade wiring (18 gauge); connect the
red wire to a positive 12 volt ignition (switched) source. It
may be connected to the fuse panel, an accessory wire, or
any positive 12 volt source that turns on and off with the
ignition.
4. Using automotive grade wiring (18 gauge); connect the
black wire to any good (unpainted) ground connection.
You may also route a wire directly to the negative side of
the vehicle’s battery.
5. Use the cylinder selection switch on the back of the
tachometer to set the number of engine cylinders to match
the number of cylinders on your vehicle.
Note: Make sure the power wire is disconnected
from the power source before adjusting the switch.
6. To change the RPM setting on the shift light, press and
hold the button on the front of the tachometer.
7. Reconnect the negative battery cable.
Be sure all of your wiring is correct to ensure
proper gauge operation.

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