Attention: TDR Forum Junkies 
BDaugherty
TDR MEMBER
I finally replaced my engine oil pressure sender today. Thanks to TDR members, I installed Cummins p/n 4921511 which cost a little under $90. Rock Auto and a few others were about $170.
Reference thread: https://www.turbodieselregister.com...-2002/211039-bad-oil-psi-switch-symptons.html
My installation tip: The sender is pretty tough to reach. It's above the starter and under the fuel filter. I accessed it from the top. Because it was so hard to reach, I test fit the new sender and found that a 1 1/16" deep socket fit. I tried and tried to get the socket on, but I thought that it wouldn't fit because the wall of the socket was too thick to clear a rib in the block. Fast forward a few minutes and I finally figured out that the factory sender had a larger hex. I dug through my tools and found a 32mm deep socket that fit pretty well. After that, the sender came out real easy and the new one went in the same way. My attitude monitor new reads actual oil psi and not just "0". Thanks to the genious of Dodge, the whole time the sender was saying zero, the factory gauge said 40. Thanks Dodge. Great thinking on that one. What if I had really had low oil psi? I'd be super PO'd to be elbow deep in my engine right now. Thank goodness for aftermarket gauges AND the TDR.
Reference thread: https://www.turbodieselregister.com...-2002/211039-bad-oil-psi-switch-symptons.html
My installation tip: The sender is pretty tough to reach. It's above the starter and under the fuel filter. I accessed it from the top. Because it was so hard to reach, I test fit the new sender and found that a 1 1/16" deep socket fit. I tried and tried to get the socket on, but I thought that it wouldn't fit because the wall of the socket was too thick to clear a rib in the block. Fast forward a few minutes and I finally figured out that the factory sender had a larger hex. I dug through my tools and found a 32mm deep socket that fit pretty well. After that, the sender came out real easy and the new one went in the same way. My attitude monitor new reads actual oil psi and not just "0". Thanks to the genious of Dodge, the whole time the sender was saying zero, the factory gauge said 40. Thanks Dodge. Great thinking on that one. What if I had really had low oil psi? I'd be super PO'd to be elbow deep in my engine right now. Thank goodness for aftermarket gauges AND the TDR.
