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I've seen two types of circuit board inside the tacho, the most common one with through-hole components (easy transistor fix) and a surface mounted component version. Sadly, I have no information on how to fix the latter.
Cheers,
Tore
Give the tach a good tap or pull it out slightly to do so too. Seem to work and mine has been working again, although I don't drive as regularly this time of year. Mine also developed an issue where portions of the digits went missing, somehow it's back to normal.
NHS seems to be the best solution just to get it back like new again.
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