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I need to monitor my RPM's to adjust my air adjustment screws on my 4 cylinder Yamaha. I have an old two wire tach/dwell meter, with one red and one black wire. It it's day, the black wire was connected to the coil and the red wire was connected to positive. I have 2 dual file, double coils. I suppose I could try and connect to those or is there a better way? The wires going to tach at the console are Grn/Red and Grn. I figure I had better check the forum before attempting it to avoid damaging something. I realize that the reading on my old tach might not be accurate, I just want to detect RPM change while turning the screws.
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I would think those old units will not work.
the Yamahas I have dealt with count the number of pulses from the lighting coil on the battery charging system -
Thanks. You're probably right. Maybe I will find a regular digital tach that I can plug into the connector on the engine.Originally posted by 99yam40 View PostComment
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they make tachs to read off of plug wire impulses, you just rap a wire around the pug wire.
even some inductive timing lights will give RPMComment
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Exactly what I was looking for, the LCD gauge with the wrap around wire. I didn't know they made those. The only ones I can find are cheapy 12.00 ones, but they appear to sell well and serve the purpose.Originally posted by 99yam40 View PostComment
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they may have a problem running along close to other plug wires, (pick up the other impulses also)
what is wrong with the tach you have?Comment
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It's too far forward to monitor while I am tweaking the carbs, plus its analog markings are very coarse. I like the Idea of a digital gauge.Originally posted by 99yam40 View Post
Yes, I was thinking the same thing about interference from the other plug wires.Comment
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