06 dodge 2500 5.9 cummins check gauge light comes on after engin is running and wont go off six seconds later oil pressure drops to nothing and seat belt alarm goes off checked oil pressure with manual gauge has good oil pressure

SOURCE: 97 wrangler oil pressure drops when engine is at idle

check the engine oil level... you could possibly need to replace the oil pump soon... if you do not live in a cold climate i would consider using 30 or 50 weight oil. do NOT use that in a cold climate as the oil is like molasses when it gets cold.
that's only temporary. one other thing to consider is a clogged oil filter... when was the last time it was changed ?

Robert

SOURCE: oil pressure guage dropping

Sounds like the sensor is failing.Have oil pressure checked with a mechanical gage to confirm. A new sensor or wiring repair is allot cheaper then a new engine!!

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: Check Gauge light going on and off

One of 3 things can cause this behavior of the oil pressure light going on and off: (1) oil level might be a little low... double check and make sure your oil is porperly topped off; (2) sensor is defective... which might require replacement; (3) oil pump problem... this can be an obstruction of some kind of the oil pump. If there is a strainer, which is typical, there might be sludge or something else obstructing the entry to the oil pump, thus, resulting in lower pressure output. It is rare, not impossible, for the oil pump itself to be defective... but again, very rare. If the issue is at the oil pump, it willmost commonly be an obstruction. Try having the engine flushed professionally. There are auto service centers with this capability. It is probably the most affordable first step to take. If after a flush the problem persists, then have the sensor checked.

SOURCE: check engine light reset

usaly You use a OBD 2 Scan tool if you do not have one you might want to disconect battery for a minute then reconect the battery how ever keep in mind if you do not fix the switch that cause the *eng light* to come on it will return when you start the car up again,Hope this helps ,John