Hi, Johnny: The location of the sending unit is in the head next to the water outlet hose, where it clamps onto the head. There should be a threaded hole there for the sender. I really like the dress-up job you've done on this engine. I've got a '62 Classic wagon engine disassembled and have dropped off just about every piece that can be powder coated and now have them all back. Once I find a source for hardened valve seats, I'll get the engine back together. - Justin _______________________________________________ AMC-List mailing list AMC-List@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list or go to http://www.amc-list.com