I'm not that technically minded Dave so can't help re voltage but this was a common problem with P1800 rev counters back in the day I.E. Massively over reading and the usual cure was to fit another gauge which usually worked. The fault is very likely to be within the gauge. Replacements are not 10 a penny like they used to be so if you cant find a good used one I think it needs re-calibrating.
|