Seens 04duxlr recommend staying away from URO hoses and drowssap found a great web site called glowshiftdirect.com to get a water sending unit that should work great as a relief value. The sending unit has a port for a senor that I can use for a copper relief value screw at least I hope.. The water sending units are aluminum and from all the post it seems to be the best route just to add a aluminum water sending attachment an add a relief value into the water sending unit treads and its then become a brand new relief value. Unless someone see's something wrong with this set up I think its one if not the best set up iv'e seen so far. Sending unit 15.00 + brass relief value screw 11.00. total 25.00.

 

if you take it to an autoparts store they can fit it with a brass radiator sill **** that you can use for venting.