OK, so my oil pressure gauge has been acting up and I have no idea what is causing it. First of all, the oil level is normal and clean and the Jeep receives regular maintenance in all ways. The problem is this, when you start the Jeep everything starts up fine but the "check gauges" light comes up. The oil pressure gauge doesn't register anything. If I rev the engine the "check gauges" light goes off and the oil pressure gauge goes up but to a very low pressure reading. I have pointed it out to a mechanic and they said everything with the engine is working fine. This makes me think its the sending unit but have no idea where it is or what to check. Any suggestions on what to do to fix it or trouble shoot it? Anyone have the same problem?