What part of Oregun are you in? I'm in Silverton these days.
I've been meaning to track down the speedo issue on my old Ram/Cummins but haven't got aRoundTuit. Probably a loose wire somewhere as the speedo was intermittently working at one point. Do those senders or gauges have grounds? Probably a bad ground I'd guess.
The truck runs the grid heater until a certain speed is reached, and since it can't ever sense that speed, it just keeps running the grid heater.
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