I just installed a new water pressure gauge on my Ranger for the 1999 Mercury EFI 150hp The pressure seemed low to me so I called Merc. to get some advice. Mercury faxed me specifcations.<br />Nothing until warmed up then: Idle 1 to 3 psi. Poppet valve opening 4 to 9 psi and wide open 12 psi...
do you need to winterize the water pressure gauge?<br />i plan on replacing gauge because needle is pegged all the way over on high side.<br />when installing new line should it be filled with water or antifreeze?
