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randycamino52 02-24-2010, 10:34 AM I have a 84 GMC Cab that the tach doesn't read correctly. The computer stuff has all been taken out and disconnected. I have a Edlebrock carb on it and standard HEI ignition. The guages all work except the tach. Any ideas? CoyoteOn2 02-24-2010, 12:33 PM Double check your hook up since your no longer useing the Computer. ↓ http://i300.photobucket.com/albums/nn18/coyoteon2/miss/tach_schem2.jpg MARKPADGETT 04-19-2010, 08:17 PM Um m m m m it could be under the distibutor cap if your still runnin points good luck ! Mark: | ||