Recent content by zxjoe

  1. Z

    Mercury 850 1973 Aftermarket Tach

    Are you saying that there is a place to mount one of the square ones? I bought one from Amazon, it should get here sometime next week. I planned to mount it on a 3d printed bracket, then ground the rectifier by attaching a wire to one of the rectifier mounting screws.
  2. Z

    Mercury 850 1973 Aftermarket Tach

    Thank you guys for responding. I tested the diodes in the rectifier using this method: Two of the diodes connected to the ground failed the test. Not sure if this is what Chris1956 was getting at but does seem to be an issue. I can't buy an OEM replacement for the rectifier so I'm getting a...
  3. Z

    Mercury 850 1973 Aftermarket Tach

    So I bought a cheap tach on Amazon, and I connected the tach directly to one of the yellow wires on the rectifier. I got a reading and was super excited, but when I disconnected the harness's brown wire from the switch box and connected the brown wire to the yellow wire on the rectifier, I...
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