Speedmoter doesn't read right need help please.

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Dec 29, 2011
86 cutlass, it's got a 350 engine, 350 3 speed transmission and a 3.73 possi rear in it. I'm in belief that the speedo gear is throwing it off and I'm not sure what gear to buy. Would anyone know what gear i need? Or even what I do need if not a new gear?
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