Chevy Impala Fuel Level Sensor?

[angel]

I bought this thing because my needle jumps. Well where do I put it now? It say "module assembly." Wellll where is that? Thanks!!

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=010&sspagename=STRK%3AMEWN%3AIT&viewitem=&item=200232723340&rd=1

 

[Andrew1]

I want to say inside to gas tank.