Stop in for a cup of coffee

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straightlinespeed said:
I can not find anything about wiring in the tach you have... Im almost thinking its not possible.

Im not sure of the quality of tach you have, but if you need a tach. I have the one below I can send you. Im not using it anymore.
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Hey, that's real kind of you! I'm determined to get this working, though. :) This is my field of expertise so I think I'll be able to pull it off. I just need to make some sort of interface adapter. No biggie once I know how both the magneto and the tach work.
 
There has to be a way to convert the input signal. Never thought about it, It has to run on amplitude or frequency I would think for a input to the gauge I would think. Both would be change on the rpm's on a magneto.
 
Do all mags have points? The only ones I have messed with are small engine ones.
 
Thought so was not sure if the signal was broken or just the rotor did it.
 
halifaxhops said:
Do all mags have points? The only ones I have messed with are small engine ones.
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I think they do. All my searches so far have turned up only points magnetos. Specifically Vertex OAC ones - which is what my tach works with - have them.
 
btw, Ray, thanks for that Wikipedia link. Didn't help much, I'm afraid. I never did think of looking there, though.
 
halifaxhops said:
Wonder what the signal comes from?
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I think I've got it figured out. It reads the current through the primary winding of the magneto. Has to be. It's the same wire that the kill switch should be breaking.

So the tach has a low-impedance input as opposed to the high-impedance input of a normal tach that senses a voltage (12V).

I'll measure the resistance and see if I can figure out how to drive it.
 
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