I have done a 5.3 swap in my 91 yj and haven’t been able to get my oil pressure gauge to work. I tapped into the little piece above the 5.3 oil filter and installed a jeep pressure gauge,(the one with one prong). I pulled the gauge out of the dash to eliminate the possibility of a bad circuit board behind the gauges. The gauge has 2 posts. I assume one goes to the one prong on the sensor, and the other goes to 12v power right? I am getting no reading. Any suggestions?
Fixed. Needed to ground the gauge.