Trying to decide between these two... I am inclined towards the temp because all I want to know is if my car is warmed up. I read before there is some relation between temp & pressure so either gauge will tell you that. The pressure costs a little more, and supposedly will let you know whether your engine is about to crap out, but then supposedly by then it is too late anyway.
Any convincing argument whether I should get the pressure for the extra 25 bucks? Also if anyone in the area wants to combine shipping with me to get one off ebay, here's the seller he has a bunch of D-Gauges both white and black face: