Originally Posted by 1 Long CJ
Mine's an '06 and it just started running a little high. Use to be just past the middle dot, now it runs halfway between middle dot and the next. I thought the newer model senders were basically yes or no. Why would it change by a little bit?
I don't think that they are necessarily "yes or no" but they don't actively fluctuate with rpms. Mine varies following a switch to synthetic oil (winter), a different filter brand, ambient temperature, etc. It also shows lower pressure at idle as it warms up and oil thins. Always between 2nd and 3rd mark (1/2 to 3/4) though.
The story is that the actual representation of oil pressure rising and falling with rpms led lesser informed owners to believe something was wrong and were driving the techs nuts by bringing them in. Mine doesn't even show psi, just dots.