new guy question

[thegoat221]

i have always been a jeep guy but i bought a 1985 silverado long bed off a buddy. his dad bought it new and it has no rust in it but my question is all my guages work except the oil pressure one and the temp guage. i put on a new sending unit and a temp sensor. i took the guages out and cleaned the back of them off and still nothing the temp guage doesnt go past 120. the oil pressure one stays at about 10 psi. i no both are wrong because the motor runs to good and i was just wondering if anyone has a idea if its the guages or somthing else that is causing them to not work. thanks