Isuzu Rodeo, Fuel Sending UNIT problems

Hi ... I have a 1998 Isuzu Rodeo (3.2 v6) and I have problems with the fuel gage, as it's always with the light on. I have realized, I'm not the only with this problem. Also that the malfuntining part is the Fuel Sending UNIT. Can anyone please let mew know how to fix this, or how much does this costs this Fuel Sending UNIT? or where to look this up?
Thx, ED.

Eh, there's a sticky at the top of the page.