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Discussion Starter #1
I'm installing a universal digital tachometer..3 wires total, one to positive side of ignition circuit, one to ground..
the 3rd wire needs to go to the negative side of the coil(s)(blue and yellow wires). My question is, will just one coil provide the correct RPM signal,
or do I have to connect to both coils? I think both coils fire once every crankshaft revolution (with a "wasted" spark from each..)
I think if I hook up to both coils, could cause ignition chaos...
 

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You can't connect it to both coils, would cause a problem. If the tach has a switch for 2 cylinder engines it should work.
 

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Discussion Starter #5
And SORRY for the extra unnecessary posts, still getting used to this NEW format...o_O
So I tested this, hooked up to just one coil, works fine! I was surprised to see that the factory analog tach is off by as much as 300+ RPM at higher revs (higher than actual). Also was pleased to see that she would idle as low as 550 RPM! (but not happily). She likes it around 950-1000 RPM idle.

Thanx Dave for your input on this! (y)
 
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