Kenneth, This is hard to diagnoise without being there to check several things. There are about 8 to 10 grounds coming off the dash . If you read diagrams, eliminate them one by one to find the problem. Example, Does your high beam and left turn signal work ok. That's one. And just go around.Is the connector making good contact. Plug and unplug it a time or two to clean the contacts. Since the tach is feed with voltage from #5 fuse ( green wire ), it is feed with voltage from accessory relay. You could be looking at a dirty contact or bounce. If you like email me privatly to discuss futher. John hervey www.specialTauto.com --- In dmcnews@xxxx, "Kenneth Kapalowski" <delorean@xxxx> wrote: > Hello all ... My binnacle instrument cluster is acting up ..