I don't think it is a reaming or not reaming problem. It sounds electrical to me. I would check your relay and fuse. If that doesn't help, check to see if the instrument cluster is grounding properly. If it's not grounded the GP light won't come on.

I just went through this. The light wouldn't come on, but the plugs where glowing. I found I had a bad ground to the instrument cluster and that fixed the problem. I had burned one of the circuits on the rpm, oil, and fuel gauge.

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