Trouble with gauges

Things to check for

1...Find a common ground point such as the ground side of the dash lighting which is connected to anything else on the board that is ground. Somewhere in that ground plane is one or more mounting screws. Connect a pigtail to that and bolt it to either the dash frame or the column support

2....Check the harness connector pins for looseness to the board traces and clean and solder them as necessary

3....The contact fingers for the IVR can loose contact with board traces. Solder jumpers across between the board traces and the contacts

4....The gauge studs can lose contact with the board traces. Loosen/ tighten the stud nuts several times to "scrub" the connection and consider replacing the "fake" nuts with real ones

5....Obtain a way to provide test resistances for the senders. If you have a rheostat or old tank sender you can set that. Provide 12V to the proper pin we were just discussing, and apply a test resistance to the gauge sender connection Each guage should read to proper point depending on resistance