2007 mercury 50 2 stroke water pressure?

What is the correct water pressure at idle and wot on a 2007 mercury 50 2 stroke? Also should I get a 15psi or 30psi gauge? Thank you!

If that is the 1:83 gearcase, .5 to 1.5 PSI idle and 5 to 7 PSI WOT.

15 psi gauge.

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