Man am I glad to see this thread:-D I am putting a early 70's Cj-5 gas tank in my 71 and I was just getting ready to travel down this road. I just measured my sending unit(stock unit for the JEEP cj-5) and it reads around 350ohms empty. Sorry, I will have to take it out to read full. That seems pretty close to the Z ### I am seeing here, maybe I got lucky. I just figured a similiar year would work on the same theroy. Hope this helps.