i have a 2004 dodge ram 1500 3.7 and when i start it it runs good with good oil pressure but when you drive it about a mile it loses all oil pressure whats going on?

 

Try hooking up a mechanical oil gauge to check if the in-dash gauge is working properly

 

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What he said.

 

Mine would drop and come back up every now and then at stop lights. Finally replaced the oil pressure sensor

 

how do you hook a mechanical guage up to it?

 

Look on the Dodge service manual (you can download it from Weedahoe's signature for your year) it will have info on where the mechanical gauge can be hooked up. If you don't have access to a gauge, I'd just replace the oil pressure sensor first.

 

found out it was just a bad connection thanks for the suggestions though

 

Thats great. It did not cost you anything and you have the satisfaction of finding it yourself. Got to get lucky once in a while.