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It could be a ground problem or part of your cluster is wearing out. The fact that it works after it runs for awhile may mean that as the one of the circut boards heats up and expands, it makes a better connection and thus the board works. One reason for this could be a small crack in a solder joint that is forced together when the board heats up. If it gets worse, I would have your cluster scanned. It may need to be removed and repaired. You can have it repaired by SpeedoTach in Concord, CA. If the cluster is removed, it can be FedExed to SpeedoTach. They do all of the GM dealership cluster work and are excellent and VERY reasonable. Christian, the Head Tech is an Ace and a very nice guy. You can talk to him. Google them or call info for Concord CA.