Pull off the lower part of your rear seat (10mm bolt just to the drivers side between the lower and upper part of the rear seat then roll it forward and up to pull out)
replacing the sender...


nevermind the special tool, a screw driver and a good wack of a hammer or your hand works great.


**EDIT**
price from a dealership is ~$50, junk yard can't be more than $15 if you pull it.