Re: RPM sensor on really old diesel engine
Tiny Tach (diesel) should do the job. The sensor clamps around the injection pipe and registers each pulse of diesel through the injection line.
I don't know how well they work but they have been around for awhile.
https://tinytach.com/diesel-tinytach
Yo could take the alternator to an auto electrician and have tach lead fitted to it. It is simple job, they attach a wire to one of the stator windings.
Calibrate any tach with a free smartphone RPM app.
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