I told you I'd forget! I got tied up with my steps this weekend and didn't think about anything but a shower and sleep afterward. I'll take some pics today.
The PO might have clipped that wire because the new senders don't run well with the old gauges. You have to put a resistor on them. See here for how I did it if you're going with the a NAPA sending unit.
http://6066gmcclub.com/forum/showthread.php?p=47576
They're pretty cheap too so its an easy fix.