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Tone Generators are great for this kind of thing. Every pulse sensing tach can be re-set correctly using a pulse generator.

Believe it or not, anybody with an audio editing program and a line out jack can create their own tone generator Very helpful when recalibrating old tachs.



(Ahem...) My age is showing. In the mid '60's I build an Allied Radio "Knight kit" tach, and they had you calibrate it using a high value resistor off the AC line as a pulse source. Nowadays, that would be a gigantic liability.

I would suspect that if you hooked ENOUGH tachs up all the same time, you'll eventally load down the ignition, but I doubt two of 'em will do it