i installed the 60 gauge and love it. i dont think id like the 80 in the stock appMy experience is the 0-60 sender w the 1/4 thread gives a more useable reading. I feel it is the best sender to use in all cases. Even as a replacement 9c1 sender. The 0-80 sender doesn't use the whole gauge scale. If you have a modified oiling system w more pressure then the 80 psi sender may be better but not for stock applications.
at idle i'm at about 25%...during normal driving up around the 60 or 70% mark. the only weird thing is at idle the needle will jump wildly sometime but someone told me that is normal.
also i've become cognizant of the oil taking longer to heat up now that it's colder out..higher pressure even after driving a bit.
ill reinforce to go with the AC delco part..i tried a generic part and it ran my fuel pump with the key off. maybe it was defective..unsure..but the AC worked great right out of the box.