I had to replace the oil pressure switch on my 1974 SB, stock engine.
The original was gray, the new one white, from a local auto parts store.
I drive the rig around town for a couple of months, then I take the rig out on the highway and 30 miles out of town, goodness, red light at every stop sign even though there is 20/50 oil in it. I had driven during the previous summer out on the highway with no effect.
Naturally, I had thrown the old switch away so I can't test to see if it is the switch and not something suddenly wrong with the motor.
Called the VW dealer (70+ miles away) The parts person 'remembered' the switch as being blue-gray, but now they are white too.
And nobody has the specs on the switch.
Are there two of them out there, one set for higher cutoff than the other?