Al, I know that my fuel pressure sensor was originally specified for oil and they said to just use it for fuel.  I would imagine that there is not much difference between oil and fuel as far as diaphragm tolerance.

That’s kind of what I figured also.  But I seem to recall that in the descriptive for an oil pressure switch I was looking at it said “not for use with fuel”, which got me wondering. I’m not so concerned about a malfunction because it can be checked every run-up by turning off the primary pump, but I don’t want a potential leak.

http://www.bandc.biz/S8012.html

I had looked at this; but it is N.O. and closes with pressure, and I want the opposite, and don’t know at what pressure it switches. I think I had a lead on one at the local speed shop that was N.C. and opened below 16 psi.  Also specified for oil.

Also, check out this great selection of fittings I just found.  I wish I had them long ago, would have made my sensor installation easier.

http://www.livermoreperformance.com/XRP_Adapters.html#Special

What a great site for fittings!  Especially now that all our plumbing is completedJ

Al