'64 C10 Help

I'm trying to find a temp sender that will corospond with the stock '64 gauge. The truck has a '75 350 and the sender in it puts the stock gauge at half way when it's cold and full hot at running temp. I can't find a sender on any of the resto part websites and Napa list them as the same one. If anyone has a part number from theirs or the ohm range that the stock gauge uses, I would greatly appreciate it.

 

Get in contact with this place, it's their day job: http://www.lectriclimited.com/mainpage.htm

 

Thanks, I will.