34 x 4 air pressure & info needed

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Moondawg I run 70-75 psi on mine I'd tried 50
but yanked a few valve stems out on the local hills. An old timer set me
straight.  I haven't had tire trouble since.  I get a little nervous
when they are not on the wheel. I always bolt them on before inflating
fully.   Does anyone know Bob Hopkins in Orangevale CA?  He needs
info on the 1915 6-40 switch panel  I'd taken mine out and cleaned,
 but not  apart.  Does anyone have one? It 's a Delco M or B with
3 light switches on B side. Ampmeter & Has the star
key lock.  Thanks Jerre