I tested the unexplored Bosch (GM) 0265 005 321 vac sensor. It has integrated check valve so you just install input hose on one side and output hose on the other. It seems it is a 5V unit. I got it with connector and a pigtail. So i supply 5V to yellow/orange (pin 3) and black/yellow (pin 2) wires and i got response on the yellow/violet (pin 1) wire. When at outside pressure you get 600mV but if you supply underpressure you get analog voltage response. My testing was limited to a hose and UP28 pump but i still got over 3V result. Hope it helps.arber333 wrote: ↑Fri Aug 13, 2021 7:45 pmI jusr ordered one GM sensor. Will publish what i find out.Cookie6000 wrote: ↑Fri Aug 13, 2021 7:28 pm Since I got the VAG sensor working, the GM one went down the priority list. Once I have the cluttered bench cleared of multiple mini tasks, I'll get back to it. I am pretty sure it was something simple I was missing
But I decided I will stick to my Volvo switch P/N 30645383 since it is really simple to use. It is digital on off and it also has a check valve. Did i mention i can find it really cheap too...
https://rrr.lt/en/search?q=30645383&exact=1