What's the formula of gauge pressure?

Whats your oil pressure suppose to be at on a 95 wrangler?

• i jus bought a 95 wrangler, its got a 4 cylinder engine, and my dad looked at it, checked all the fluids and everything before i started driving it, now i think its jus an idiot gauge lol, cause when i start the jeep, the oil pressure goes straight to the end, i believe its 80, and it stays there, and when i shut if off, the gauge comes back down to bout a 1/4 of the gauge then slowly comes the whole way to 0, so thats y i believe its an idiot gauge, but i dont wanna screw up my engine if its not lol, so do you think its jus broke, or my oil pressure is too high, also what is it suppose to run at, and as a side thing, at night, when i turn my lights on, everything works fine, jus i cant see the gas gauge, i think the bulbs burnt out behind it lol, is that easy to replace?, is it even worth replacing

• Answer:

  The dashes in the wrangler and cherokees had notorious problems with the gauge cluster connectors wearing or getting corrosion over time. You can pull it out (gauge cluster) easily and wiggle the connectors and make sure they are making good contact. My opinion on your oil gauge is the oil pressure switch is bad. They usually will default to full open when going bad and show the max pressure on the gauge (usually 80). You can have that changed easily and fairly reasonably. The oil pressure switch on a 95 4.0 I6 engine is about 35 bucks at auto parts stores. Good luck!