I recently purchased a 1997 U320. It needs a few things repaired:<br/>Tachometer - goes rom 0 to max rpm every minute or so. Screen reads "test"<br/>Fuel gauge - when it reads 1/2, the tank is close to empty<br/>Dash - a/c compressor clutch locked up. blend door only work is dash vent mode. defrost and floor do not work<br/>aqua heat - burner will not light but the fan turns on<br/><br/>I live...