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Old 23-07-2012, 03:06   #1
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2GM Tacho

I had the tacho out while other work was happening, and I guess it got a bump, because now the needle doesn't sit at zero but up around 1200w with things turned off.

I will take the back off to see it there's away to zero the needle, but wondered if anyone has done this and has any handy hints, before I maybe bugger the thing up.

Graeme
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Old 23-07-2012, 04:01   #2
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Re: 2GM Tacho

If the Tachometer pointer does not return to zero (to ± 50 RPM) when the ignition is turned “on”, the tach might not be receiving 12 volts, or it has been damaged.
BTW: Yanmar tachometers often read about 100 rpm above actual, at maximum rpm.
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Old 23-07-2012, 15:53   #3
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Re: 2GM Tacho

Quote:
Originally Posted by GordMay View Post
If the Tachometer pointer does not return to zero (to ± 50 RPM) when the ignition is turned “on”, the tach might not be receiving 12 volts, or it has been damaged.
BTW: Yanmar tachometers often read about 100 rpm above actual, at maximum rpm.
The needle moves when I run the engine - reading high by about the zero offset.
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