water pressure guage 15 or 30?

[dadgummit]

On an '84 merc 150 v-6 do I need a 15 psi or 30 psi guage? thanks.

 

[hkeiner]

Re: water pressure guage 15 or 30?

I would suggest the 30 PSI gauge. The shop manual for your motor will specify what the minimum water pressure should be when the motor is running at WOT. The minimum spec for my motor is 12 PSI at WOT. However, it is better to have a gauge with a range that is much higher than the minimum spec.