After doing my 6.0 swap everything seems to be running good, but when I crank the truck and it sits at idle when cold I am only seeing around 15 PSI. Using an electrical autometer, sender is threaded into the oil cooler block off plate. But when I rev it, it will come close to 50, then back down well below 25 at idle. Think it is the accuracy of the guage or should I be worried? Thanks for any help.