New Tachometer not working

[spareparts]

black to ground, purple to ignition, grey to signal, if you have a light blue, it goes to the light

[Illogikal99]

Originally Posted by spareparts

black to ground, purple to ignition, grey to signal, if you have a light blue, it goes to the light

my ignition wires consist of 2 black, 2 purple, one grey... I've wired everything up they way IT SHOULD BE, no go. the tach still does the same thing! wtf!? a little lost here. on the bright side all my other gauges work great and the new wiring job looks like an MIT senior thesis project! whats going on???

[phatdaddy]

i have hooked the tach directly at the engine, bypass the wiring harness, to eliminate some varibles. if it works , then the problem is in the wiring, if not, either sending unit or tach itself.

[spareparts]

check to see if your engine is charging while running, the tach takes a signal off the voltage regulator, if the tach isn't working, I check the charging system