I have a problem with the oil pressure readings on my 2000 3500 (auto). The other day I found a mouse nest inside the air intake and removed it. Today I fired it up to drive into town and pressure read normal. 5 miles down the road it read "0". I shut the truck off and the gauge went up all the way to max. The engine doesn't sound like it's running with no pressure but zero readings concern me. My question is, where is the oil pressure sending unit located? I'm wondering if the mouse could have chewed the wire (?) or do I have a real problem here? Is there anything else I need to check? Thank you and I really appreciate any help on this matter! Jim