Replacing Oil Sending Unit 2003 Chevrolet 6L Silverado

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How to get to the Oil Sending Unit on a 2003 1500HD Silverado 6 Liter engine that can also be found on 2500 and 3500 trucks. Symptoms were that the oil pressure started going from 0 to 80 while driving, after the replacement the oil pressure went up to 40 and stayed there.