I had that same problem when my battery was going dead, when it would get low volts, all the gauges would go up... weird. Worked fine when I got the new battery...
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Joe!
1988 GT, 167,000 miles!!! 13.58@105mph Check out my listing!
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99 Ninja ZX-6R:10.32@135mph!
1993 Olds Eighty Eight LSS 16.40@88.8mph