Are you tapping your pressure gauge from the switch location?For reference, I have a mechanical oil pressure gauge in my car. At cold startup it reads 90-100psi. At hot idle it reads 40-50psi. It fluctuates dramatically on the track with RPM, but never drops below 30psi. I'd say 10psi at idle is too low.
FWIW, I still have the oil pressure switch connected and it has never come on while the engine was running.