what wire is for the oil pressure on a 84 z28? Also for the water temp gauge as well as the tach non of them work in my car and have after market tach and water temp but want the originals to work to clean up the dash of the car.

 

Oil pressure sender is a tan wire from the sender on the top of the block beside the distributor, pin E5 on the firewall connector and pin 13 on connector C2 on the back of the IP. The coolant temperature sender is dark green from the sender between the #1 and #3 cylinders, pin E5 on the firewall connector and pin 7 on connector C2 on the back of the IP.

 

OK what about the tach? I have a aftermarket one in the car was like that when bought the car.