I used a large set of slip joint pliers to remove both the sedan and wagon senders. I put the pliers straight down onto the sender and used a large screwdriver with my left hand to turn the pliers. They are tight, but don't seem to be *that* tight even after 26 years.

-Tad

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1995 G320
2003 C230 Kompressor Coupe
2005 ML500
2007 ML350