Gauges don't run through CCMWhen car starts Tach needle swings all the way up like a self tests, then drops down to bottom.
Also common problem with ageAlso gas gauge gauge does not show any bars, tank is full
Test the tank sender for proper resistance through it's operating range and clean if necessary.gauges don't run through ccm
tacho problems well documented in 90/91 cars
also common problem with age