8 year old ground connections, 8 year old sender, 8 year old connections under the dash. Could be any of these, and maybe there's a gauge annunciator in between that has an issue. Dash grounds & rear of coach grounds are probably due for a checkup anyway. Then the sending unit's connection, then change the sender. And then post your results.
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Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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