Water pressure gauge install feedback

[Moody Blue]

Early in the season I installed a 0-15PSI pressure gauge on my 1971 Merc 800. Had just installed a new impeller and pump housing so I was getting the best performance out of the pump. I installed it in-line in the telltale hose. For all intent and purpose the gauge was useless. Only at WOT would the gauge read about 2-3 PSI.

I then decided to connect it to the port on the waterjacket cover (between cyl 2 and 3) to see if I could get any better results. I also have a temp gauge so I installed a T into the port on the waterjacket cover and connected the pressure line to one side and the temp sender to the other side.

So much better now. At idle I see about 2-3 PSI and at WOT about 12 PSI. Now I have a usable gauge.

 

[daveswaves]

Re: Water pressure gauge install feedback

Early in the season I installed a 0-15PSI pressure gauge on my 1971 Merc 800. Had just installed a new impeller and pump housing so I was getting the best performance out of the pump. I installed it in-line in the telltale hose. For all intent and purpose the gauge was useless. Only at WOT would the gauge read about 2-3 PSI.

I then decided to connect it to the port on the waterjacket cover (between cyl 2 and 3) to see if I could get any better results. I also have a temp gauge so I installed a T into the port on the waterjacket cover and connected the pressure line to one side and the temp sender to the other side.

So much better now. At idle I see about 2-3 PSI and at WOT about 12 PSI. Now I have a usable gauge.

Hey MB, I tried a temp gauge in the same spot, only trouble was the temp gauge I had did not start low enough (automotive gauge) so it always showed cold or 120deg F. What kind of gauge did you use?

 

[corm]

Re: Water pressure gauge install feedback

hi,
this one starts at 60.
http://www.perfprotech.com/store/product/TEMP-200F-BLACK-79-883628Q-1,70599.aspx

 

[Moody Blue]

Re: Water pressure gauge install feedback

Temperature gauge I have is made by Beede and reads from 60-200F. Bought it off ebay.

Even with this gauge I still only see the lower end of the range while operating. These motors are really cold blooded.