Hi I'm new to the site. I have a 91 Dakota 3.9 auto 4x4. It seems to have a oil presure problem, the gauges works good for about two three minutes.
then quits , and the oil light comes on.. I have changed the oil sender, oil and filter. any ideas

 

oil sending unit?

 

all ready done still nothing

 

Make sure you have enough oil first. I've heard of the oil pumps going bad but it is probably just leaking oil somewhere/everywhere.

Do a search for plenum gasket. Open the butterfly valves in the throttle body and look in the intake with a flashlight, if it looks wet at all it is probably a blown plenum gasket.