water psi gauge

[SBret1]

hey all,
newbe question, I have a water psi gauge I would like to install on a 2004 115 EFI saltwater series but I'm not sure were on the outboard to connect it, I have only had this boat a week or so and I just replaced the impeller and figured a Gauge was a good idea,,,,,,,,,,thanks for any help

 

[Bill Kilgore]

Re: water psi gauge

I can not tell you where to install or connect your gauge as I am not familiar with your motor. I did however install a Teleflex brand WP gauge on mine last year, and it came with some pretty decent instructions as to where I needed to install what.

Just my two cents

 

[75TowerOfPower]

Re: water psi gauge

Usually if you take the cowl off you will see some lines running vertically on the back side of the motor. Most of the time these are lines running to circulate water out of the water jackets. You can install a tee there and run the line back to the gage cluster.

 

[Silvertip]

Re: water psi gauge

The photo below is for a three cylinder Merc but your four banger will be very similar. You have a couple options for where to pick off for the gauge. Either one will work. Keep in mind that the idea of a water pressure gauge is to also install a new impeller at the same time. You then note WP readings at idle, mid range and WOT. Any deviation from those numbers down the line means the impeller needs attention or that something else is amiss.

1) "T" into the tell tale line as I've shown in the photo below.

2) There is a port in the upper right corner of the cylinder head as shown in the second photo. If that port is not being used for a temp sender, screw a hose barb in there. (Temp sender is shown in this photo).

 

[SBret1]

Re: water psi gauge

Thanks all,
with the help of those photos it shouldnt be an issue,thanks again.