[Desert_Rob]

I have a 2010 SS with hot heads and cam, I bought the car recently in great shape. The factory oil pressure gauge started reading zero after a few months, but no ECM low oil pressure alarm telling me to kill the car immediately, so I thought it's after the ECM , the sensor is likely still good. I changed the sensor, same result. No pressure showing at the factory gauge, but still no ECM alarm telling me to shut it off due to no oil pressure. I built a test rig with a mechanical gauge to use at the oil pressure sensor port, removed the sensor to test it. the test was good, great oil pressure as I expected. The thing I don't understand is that I still did not get an ECM low oil pressure alarm, even with the sensor not installed during the test. I let the motor warm up, still no alarm. If anyone has insight on what it might be I would appreciate it. I don't know if the previous owner might have done something to disable it, so I am going to install a permanent mechanical gauge from the block off cover near the oil filter to be sure. Good thing is, after I got the oil pressure sensor installed after the test, the factory gauge is working again. Would appreciate thoughts on the ECM oil pressure alarm possible causes of it not functioning.