Fuel pressure gauge question

[109jb 181]

The airplane I'm working on has a  mechanical fuel pressure gauge. I think it is a UMA brand. Anyway, it has 2 ports on it labeled P and V. I assume P is hooked to the fuel line to sense the pressure and V is the vent which could either be hooked to nothing, or just to an overboard line in the event that the bourdon tube springs a leak. Can anyone verify? I tried looking up directions for it but can't seem to find any.

[ChrisBolkan 130]

That's what I did. Just hooked a bit of line to V and let it vent overboard. I figure that's there just in case the diaphragm breaks. I had to put a tiny orifice in the P line because the needle vibrated like crazy until I did. I am sure there are much better ways to do it, but I took a round lead fishing weight, crushed it, and shoved it in the line upstream of the gage. It did pretty well at limiting the pulses getting to the gage so it now reads steady.