wiring on 1993 Buick Roadmaster

i need help ----my speedometer,odometer and volage guage work on and off,they go from pegged (in both directions) to correct readings..sometimes when i tap on them .i am looking for a wiring problem,but i don't know where to start

Asked by for the 1993 Buick Roadmaster
You may want to start by taking it to a repair shop. Diagnosing electrical problems is a skill that is developed over many years. If you really want to try, learn how to be proficient with a multi-meter, and reading and deciphering wiring diagrams.
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i need the firing order for the 1995 buick roadmaster