Anyone here know how to test the Oil Pressure Sending Unit to see if it is bad? I have an '04 SE CC with 93,500 miles on it and the Oil Pressure Gauge has recently started acting weird. It will peg out on H when the truck first cranks and will only return to the middle (normal operating range for the first 93,000 mile) when I come to a complete stop. I've searched other posts on the forum and I can't find a spec on how to check the sending unit with a multimeter. Any help from you pros would be appreciated. Thanks.