Found it:
http://67-72chevytrucks.com/vboard/s...d.php?t=703349
On my last post, there is a link to another thread. Rich Weyand & Hatzie are the ones that are knowledgeable in this dept., and they both have links to other other threads or info. This should help you get squared away. I found this thread before I replaced my sensor, so I din't have any issues.