oil pressure problem plz help
 

I own a 1996 Dodge Ram 1500 5.9 liter When my truck is at running temperature and i'm idling my oil light comes on and after it idles for a minute my oil pressure drops to 0. I had 5W-30 in it and changed to 10W-30 to see if it would help and it did nothing. Alternator light is not on so idle is not to low. I also redid my valve cover gaskets because they were leaking a little.
Any Ideas????:confused: Thank You

throw a mech gauge on the motor and see what that says. sometimes the electrical gauges and give you false readings.