What should i check for all other gauges work except the tach.

Bruce

 

Ground and tach signal from the coil- post.
https://classicoldsmobile.com/forums...ck-wiring.html
https://classicoldsmobile.com/forums...-question.html

 

You should check the wiring diagram in you Chassis Service Manual (FYI, the wiring diagram for the Rally Pac is in the Accessories section in Chapter 15). You'll find that the wiring for the tach is completely unrelated to the wiring for the other gauges. The tach has separate power, light, and tach sense wires. The ground is provided through the case to the ground straps in the dash.

 

would you be able to send me the diagram

thanks

 

Looking for wiring diagram 72 442 w30

thanks bruce

 

Hey Bruce I just took some pictures out of the service manual and I can text them to you if you want? Text me 317-727-7041.
Scott