1992 Pontiac Bonneville

My dashboard has died! The only working gauges are my speedometer and Rpm's. I have taken my dashboard apart and checked the main grounds on both foot-wells, as well as the Ground Buss's under the carpet. I've wiped clean the pins that plug into the clusters and replaced evrything and still got nothing. The only time my gauges work is when I am driving and accelerating, but the second I take my foot off the gas the gauges drop dead again. I can also get them to jump when in park and reving the engine. Can anyone tell me what to do next?
June 23, 2006.

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