Wiring and a small rotary potentiometer behind a removed truck d…

I had this old rotary DP4T switch in my junkpile, and it's perfect for this application. The 2 poles will feed the 2 PCM inputs; the 4 throws will be OFF, LO, HI, BOTH.

It's POSSIBLE that this (clickable) switch is equivalent, but I haven't confirmed that:
{-Clickit

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Owner caption September 2011 · Photo 149 of 401