This is an issue with electrical problems in general. People replace a
part and then say that "fixed it" so the old part must have been bad. In
older vehicles in particular this is often not the case. Starters and
alternators are examples where this happens in Vanagons, IMHO. The real
fix may have been simply removing and reinstalling the connections, and
possibly cleaning the connections "as long as I am in there".

Mark

Dennis Haynes wrote:
> It would be very rare for an oil pressure switch to completely fail out of the box. I've seen them be way out of tolerance not yet one that didn’t work at all. It is possible that you really have a wiring issue and that moving stuff made the system work for now. This is usually the case when someone thinks they fixed an operating problem by replacing the temp 2 sensor. Simply wiping the contacts or moving the wires where crimped in those connector terminals did the fix.
>