fuel sending unit

22dog22, How I did it was a little work. Knowing my tank was 16 gal. I ran it down to about 1/2 tank, then pulled the gas line off the sending unit. I hooked an elect. pump to the sending unit and pumped the last 8 gal. or so out. The reason I did it that way was to know when the car would actually run out of gas. Then I hooked the gas line back up and added 1 gal. of gas and set that as empty on the gauge (kind of a reserve). I then added 4 Gal. and set it to 1/4 tank, then 8 more gal. and set that to 3/4 tank, then I filled it @3 gal more and set that as the full setting. I then saved the settings and it was as close as I was going to get it.
I also mounted the unit behind the drivers side front kick panel for easy access in case I had to fine tune it at all. Hope this helps!