Measuring Diesel RPM??

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Originally Posted by Bill O

with one of these hand held tachometers, you just hold them against either the crankshaft or a pulley shaft:
https://static.summitracing.com/glob...82682_w_ml.jpg

That could work but per the manufacturer for some of these it needs a light strobe attached to the flywheel "Fabrication is required. Modifications to balancer or flywheel are required".
Seems like a lot of work for an aux. sailboat motor if all you want to know is the offset from the tach reading and real rpms. Maybe good for a powerboat attempting to synchronize multiple motors, but then again they probably have factory stock alternators, so the tach gauges are somewhat accurate.

Bill O.

Bill O.[/QUOTE]

hmmm. the one I have you just press against the shaft and it reads out the rpm. simple.