Tach not working

[82Ghost]

Tach not working, any suggestions on where to start on finding the issue? Way to test to see if its any good?

 

[jrichker]

Tach not working, any suggestions on where to start on finding the issue? Way to test to see if its any good?

How good are your electronic/electrical skills

 

[82Ghost]

Not all that great. Will say it seemed they had an issue with the circuit board, burn mark, before I got the car. Fuel gauge not working, tach not working, high beam indicator lights up on low beam and shuts off when high beams on. Both blinker ind come on when lights are turned on also. Haven't pulled the dash out yet to confirm. Working on getting it to idle right now, chasing a vacuum leak

 

[82Ghost]

Pulled the instrument cluster out, circuit board has corrosion on the ground circuit going to tach. Prior owner pulled the pin from plug and ran a wire directly to tach. I have a new circuit board ordered from NPD, but need direction on how to ck tach and wiring.

 

[82Ghost]

Got the new circuit board installed, everything else working now except the tach. Testing the wires on the harness plug using the elect diagram, the red wire did not have power with ign on, should it?