I drive a 90 LS400 owned for about a month. The RPM Gauge has never worked since I've owned the car . My Temperature Gauge bounces up and down it mostly stays up with any speed bump or the bass of my stereo. I dont know what to do, I've had it checked at a shop. The water pump, thermostat, and the radiator seem to be working fine. The car has alot of problems but the temperature gauge bothers me the most. Someone please help me!!
Oscarmanny