I was driving down the highway on my way to work thismorning and happened to look down and see both the oil pressure and temp gauges slowly climbing at the same time all the way to max (right). They stayed there for about 10 seconds and then slowly began to return back to normal. It then happened again a few times on my way home. Now I could understand a bad sending unit if only one gauge did that, but what would make both do the same thing at the same time??