Went to skycraft and bought a SPST on-on switch and some yellow/white awg 20 wire.
Wired the Emag and Pmag as far back as the rear of the panel. Removed the top skin for better access. I labled each wire at the mag, at the end that will connect to the switch behind the panel, and where the wires enter the firewall into the battery well.
I drilled a 1/2 hole and installed a grommet where the wires will come out the top of the z frame to go forward to behind the panel. Thought about how to eliminate chaf points, I think I will need to attend the that issue.
Both the Pmag and Emag have 3 wires aside from the wire that grounds to the engine and the jumper wire between two ports. A 12v + wire that will run aft to a circuit breaker and hence to the main bus.....a P lead that runs aft to one side of a switch (the other side of the switch will go to ground at the firewall ground point? and a yellow/white awg 20 wire that sends the tach signal.
The E/Pmag will not send a tach signal when turned off. That means that it is difficult to do a mag check. The yellow EIS tach wire was pulled back through the bundle to behind the panel. I intend to wire the yellow EIS tach wire to the out position of the switch and the emag and pmag tach inputs to the other two poles so that the switch will change the E/Pmag from which the signal is being read.
I installed a 2-3 switch for the Pmag, having removed the progressive type switch that was there before under the Bob Nuckells theory.
