I have a 1988 Celebrity with the 5.0LX motor and I am having an issue with the tach not working. There appears to ne a black box under the steering wheel that the wires go into but no output from it. Any ideas??
Howdy
The tach doesn't have any wires which feed anything. Connections are:
Sense (gray wire) which comes from the negative side of the coil
Power (purple wire) 12V from the ignition key circuit and can also be used for lighting
Ground (black wire) Negative
If you have a switch which turns gauge lighting on there could be one additional wire
Get a hand held tach and connect to the gray wire on the tach with engine running. If no reading, check continuity between negative side of coil and the gauge