How ya doin’ doc, haven’t heard from ya for a while.
I don’t know ’55 and I don’t know GMC but I do know ’50 Chevy and here is a link to a couple of things that I ran into when I rebuilt my sender. Now remember this was a 6v system.
“I tested the range and it runs from 1.9 ohms to 38.1 ohms. Couple of pics here, take a look.”
http://rides.webshots.com/photo/2810310490098611668EngTlM The thread was here if you care to read it.
http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=3;t=002823#000000
Hope this helps ya out Paull.
Denny Graham
Sandwich, IL