I HAD an oil pressure gauge on the truck, i have since removed it. I just wanted to check the accuracy of the stock gauge and solve the mystery of the delay in the oil gauge on startup. How i DID have it hooked was through the oil pressure port on top of the oil filter adaptor. I ran a braided line from there to an Autometer Sport Comp gauge mounted on the air conditioning intake duct. I had it on for a week, then took it off. You could do it the same way, just run the line through the firewall and mount it somewhere in the cab.