I am rebuilding an 802a and had a bad fuel sending unit, checked by TM. I order a new on ebay but instead of a one wire and ground wire to the base, I have a 4 wire connector to the new unit. 2 red wires and 2 black wires. The bottom of this unit has 2 sliding tubes on an L shaped tube instead of the float arm. Has anyone traded these out? Your input would be appreciated.