Review on ACDelco D1843A Original Equipment Pressure by Kevin Webb

Over the past year the oil pressure gauge has occasionally jumped and read zero. I knew it wasn't an oil pressure issue because there was oil and the engine wasn't knocking. It was the oil pressure sensor or "gauge" as I call it. It took 15 minutes on my 2004 GMC Envoy. Remove the plastic protection plate. Climb up next to the oil filter on the upper passenger side and you'll see a connector that connects to the switch. Disable it. If it's the same as mine, it's full of oil so you should clean the plug. I used the plastic electrical contact cleaner I had to clean the throttle body. Spray it several times, drain all the oil and let it drain. Make your life easier and get this vintage pressure switch removal socket https://www.amazon.com/Lisle-13250-Pressure-Switch-Socket/dp/B0002SR2RY/ref=pd_bxgy_263_img_2?ie=UTF8&psc=1&refRID=67K222NDQTA41XW5N7FR I used the short socket wrench and it came out pretty easily. Screw in the new switch and gently tighten (you don't need 100 ft-lbs of torque) and tighten securely. Use common sense here and don't be an idiot who tightens it full force on a foot-length ratchet and complains that it's broken. Reconnect the plug. Reattach the protective plate. Enjoy that your oil pressure gauge doesn't drop to zero and keep ignoring the gauge because it's pointless.