External Tach for tuning?

Zeus36 · Mar 14, 2017

I switched from the stock silver face instrument dash to an OEM dark face one. The replacment tach shows 500-600 RPM while the old one showed 1000. So I don't know if the original or the replacement OEM tach is correct.

Does anyone use another temporary tach for tuning?

Also, is there a way to calibrate the factory unit against the external one?

Traumahawk · Mar 14, 2017

Replacement tachs usually have setting for the number of cylinders. Does this one? I find it interesting that its reading basically HALF what the factory tach is.

EDIT.....sorry was thinking that you were talking about an aftermarket tach.

davesax36 · Mar 14, 2017

Is one from a pre-90 and one post-90? The wiring changed in like 89,right?

Zeus36 · Mar 14, 2017

Both tachs are Yamaha Vmax factory instrument panels. My stock silver one is a 1997 unit. It works fine and is in storage with all the rest of the stock pieces. The one I replaced it with is from a 2004 Vmax. What I am looking for is a digital tach for carb/mixture/idle tuning and also calibrating the OEM analog tachometer - if that is even possible. If not, I can mark the gauge cover glass like we did with helicopter gauges.

Last year I went through THREE (3) Sunpro Super Tachometer III units. They each lasted a few weeks before they grenaded from the vibration (I got refunds on all of them. The last one they said don't even bother returning it). But those are electro-mechanical as well.

I was wondering if I could use an old dwell/tach meter, but again that would not be digital.

External Tach for tuning?

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External Tach for tuning?

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