Where do I put the guage sensor?

Jack
Most of the fittings I used were 3/8 NPT. On the hose end I used a 5/8 Barbed male hose end.w/ 3/8 NPT thread. To attach the "T" I used a 3/8 NPT male union, into the manifold, The "T" itself will prab have to have some kind of adopters, to make the new bulb fit. Mine is an LD-340 manifold, which is one of my fav's. I have this same settup on my 91 Ramcharger also.
Hope this helps.
Dave C.