On my 93 Dodge Caravan ES 3.3L, when it comes to a stop and idles (at a light mostly) the check gauges light comes on. When the check gauges light comes on the oil gauge is at the bottom. When I tap on the gas to the oil pressure goes up and the light goes off. Whats up with this? This van has 173,000 miles.

Okay What it means is that the oil in your car is either low in level or the oil pressure at low revolutions is low. I highly recommend you to stop driving the car when this happen because you can internally damage the engine with a low oil or a low pressure of oil. Check the oil level first..make sure level is fine and oil looks good. Black and burned oil will give you a low oil pressure as well. If it happen that your car need a oil change. Make sure you get it done and see if the problem goes away. Very rarely oils pressure sensor goes bad but if oil is new and level is fine you can take the oil pressure sensor and connect a tester for a oil pressure. If this is not under the manufacturer specifications.. oil pump is worn out and you have to replace it for a new one.
Good luck and don't forget to rte me. Thanks