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Ive got a 1990 grand prix Turbo and the gauges are all wacked out. The tachometer is up around 8k when its sitting at idle and the fuel guage jumps all over the place, the speedometer shows about double what the Heads Up Display shows, the temperature guage is way off it sometimes goes around 260 and drops back down to 180 sometimes (we just replaced the thermostat). the only thing that seems to be working right is the boost gauge. Thanks alot