CaliStang97:
Welcome to the forum!
The previous owner may have taken the needle(s) off to slip on a white-face gauge overlay and then took them off prior to selling the car. Perhaps he was sloppy when putting the needle back on? If he really pressed on the needle to re-seat it then he may have damaged the gauge and you will need to get a replacement cluster.
Your car is +99 so can't you use your odometer to retrieve operating info like oil pressure?
If the odo area does not give you the info you need then take the cluster out, remove the clear cover, plug the open cluster back in. Next, use a salad fork to gently (very gently) lift the need off the spindle. Start the engine and put the needle on (lightly) where it should be. Turn off the engine and see if the needle touches the zero stop. If so, gently press the needle onto the spindle but don't push too hard or you will damage the gauge. If it is still off, start the engine and adjust the needle by the amount it was 'off' and see where the needle goes when the engine is off. Repeat until perfection is achieved. Keep the fork handy.
HTH,
Chris