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Speedometer Calibration

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Hey everyone, been a while since I've been on here. Railroad hobby been getting in my way. Anyway, now I have an issue that I want to through before the collective. I've had a Superlift TruSpeed on my truck for about 8 years now. It's worked great till about a month ago. Now, if it's cold it doesn't work. As the cab warms up, it starts working. I've bypassed it and know the rest of my electronic system is working just fine. I cannot find a new one.

Superlift won't be getting any new ones for at least 3 months.

I've called Dakota Digital and they say their module won't work on my truck.
Hypertech says theirs will adjust for my 37's but changing the computer's setting. :confused: I thought we could only adjust to 400 something revs/mile? I need 552.

Anyone have an option I haven't thought of? I would like a correct speedometer.

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