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Hello: My wiring diagram covers 0001-0759 for the tachometer. The right rear mag has two wires for the tach K-EG5 is a ground wire and K-EG4 goes to the rear pickup terminal on the transmitter. This is mounted mid-ship to the pilot control column. The tach generates an ac signal you can read with your meter. The easiest thing to do is switch the front and rear pickup leads (K-EG4 and K-EG2) and see if the problem follows the wiring. Color-coding the wires at the transmitter and tachometer will help keep it all sorted out.
Dave
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