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After switching sensors the SLOW issue went away, but now the motor shuts off randomly. Prior to the sensor change it would shut off and come back on randomly.
This would not happen at idle.
Rectifier is the simple triangle 3 lead style. I switched tachs and the new one seemed to work correctly but still went haywire a few times.
The original tach had a 4th lead which after looking at a few others appears to be power for the trim guage if connected. Not sure why grounding it somehow made it work better in this situation but it still wasnt reading accurately even with this band aid.
Hope your hot water comes back but at least with the heat wave it has to be luke warm still in the pipes!