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post #8 of Old 06-03-2013 Thread Starter
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Re: Yanmar tach reads low rpm

Thanks for the tach schematic...I wonder if some tach disassembly is required to get at the 'range selector switch' and the 'calibration' screw.
Looking at the back of the tach as it's installed in the engine control panel, it looks as if maybe the 'body' could be removed as it may be covering/protecting the adjustments that may be the culprit.....
If the 'range selector switch' is set to the wrong tooth count range - seems like it would cause a large error in reading accurate rpm.......
Anyone disassembled a tach before?
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