I have seen a few threads about speedos but none seem to be same as my issue. Mine just sits at 10 mph and doesnt move. Shut truck off and still the same thing. The wiring from sensor seems to be good. The dash is that odd one without the needles if that makes any since. I was also wondering if anyone has used a secondary pump in line for the fuel in order to bypass the factory one. I took the engine computer and all that out and now I run a carbed 350.