Re: water temp. or pressure gauge?
BOTH! you gotta remember a pressure guage wont tell you if it's water or air in the top of your cooling system...I have seen alot of V-6 merc FRIED from overheating,and the guys say they had pressure right up till the plastic pressure hose for the guage melted...dont get me wrong, they are very useful, but paired with a temp guage....