Started driving the 05 Denali Yuki the other day and the low oil pressure flashed in front of my eyes. So, turned it around, there was pressure, but it was low. Home, checked oil level. Fine. Listened to heads...fine. Ok, so through a new sensor in, and...still got message. So I dig some more, as this is a 6.0, and I see some stuff about a filter under the sensor you should replace. Ok, go to the dealer. Get me one, talk to a mechanic while waiting, says he always replaces it, but said he always checks the oil pressure at the filter. Get gome, use a pick and I use a pick and finally call the dealer back with the vin, and there is no filter on this truck. So, put it back in, nowmit works. Next day, drive to Chicago, 12 hours each way for thanksgiving. Changed oil before I left. Did t use a drop. Come home, no problem, and have message again. Check switch with Ohm meter. Switch is fine. Ok, it's past me, other than hooking up a manual gauge at the sensor. Suggestions?