What year is your truck? I believe all up thru '66 use the 0-30 ohm sender, I could be wrong though, '66 might be different.
Here's a link that was just posted in 'Racing and High Performance' that talks about fuel systems, and also the thread on this forum.
http://www.centuryperformance.com/fu...e-spg-140.html
http://www.67-72chevytrucks.com/vboa...d.php?t=376000