Re: 2QM20 Tach wiring
That's more or less the same thing I have, yes. Stick a piece of reflective tape to the front pulley wheel, and measure the blips. Your alternator should have three wires coming form it, (+), (-), and signal.
I'll probably get this done tomorrow - it's on the jobs list.
Bashing about on Lake Ontario and Beyond
"Ariel" '79 Endeavour 32