Mark, check the Kirkham gauge, grounding and connections. Before I had a couple electrical issues sorted out recently by Steve at Mustang Ranch, my
oil pressure gauge once or twice registered zero
oil pressure, even after driving it with normal
oil pressure and then restarting it minutes later. My voltage gauge also had some issues once or twice.
Steve at Mustang Ranch knows his "you know what" when it comes to electrical and rewired, regrounded and reconnected things better on my Kirkham.
Sorry, my lack of electrical knowledge knows no boundaries.