2000 dodge 1500 passenger van showing abs codes 36, 71, and 72. check engine and check gauge lights are on and oil pressure gauge reads 0 so I had oil checked and the oil is fine? what am I dealing with exactly?

SOURCE: Low Oil Pressure on 1992 Chevy 1500 Pickup Truck

1992 silverado pickup has a problem with the oil pressure Gage on the dash board fluctuate when i put break on or accelerate the gas 

SOURCE: 4.7 liter oil pressure gauge malfunctioning.

Check or replace the oil pressure sending unit.

SOURCE: Come to stop 99 Ram oil pressure drops to 0 check gauges light.

Change the oil! The 318Cu in V8 (5.2 liter) engine has a problem with sludge build up on the oil pump pickup tube screen. This engine requires oil changes at or before 3500 miles with a high detergent oil.

SOURCE: oil pressure gauge goes up when car started, but then down to 0

u Have a problem with the oil sending unit. The sensor is located beack right side of the engine block. Take out the switch and make sure u have good oil PSI. Should be 6 psi at idle and around 50 at 4000 RPM. If the presure is ok replace the switch they are very cheap about 20 bucks. Please rate.

SOURCE: 2004 Dodge Ram 1500 5.7L at start up check gauge

Sounds like the oil pressure sending unit needs replaced.