Oil pressure stay around 30 psi,no matter what

I have a 92 GMC Suburban with a rebuilt engine.My oil pressure stays around 25 thru 35 psi all the time.I use 5 30 oil.What would cause this or can I test something?The guy I brought this from didn't fix anything,wow!:banghead: What would cause a tire to go bold on the outside?My stabilizer pins are not connected.My My truck shakes and pulls from that side.