ive had this happen to me as well, not exactly like you explained it... mine goes nuts while falling back down. 240's gauges suck, hands down. lol.... there have been many different complaints with them. with age they seem to go nuts, or give out. the gauge in my nissan truck says im going 35 when im sitting still.... i say if it bothers you, replace it like mk said, and hope its not another lemon unit.... good luck, hope you find a fix. if you do let us know... if its not that complicated i may take my cluster apart and tinker.
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