I have a 1991 RS with 305 TBI, several of my gauges aren’t working. The speedometer, temp and voltage work fine.

the issue is the Tach and the gas gauge, I’ve read that the tach could be the printed circuit board so I’ve order that and hope that solves that problem which is it pegs out when you start the car and moves very little.

the gas gauge moves a little but I’m not confident of what it says. I don’t see much on a gas gauge issue, any thoughts or suggestions?