55.2 did not have an electric gauge so your cluster probably has a 56 or up, which uses an O'Reillys WT203 (TS6) sender. Screw it in the motor where the other one was and wire it to gauge. Easy. One gauge post says "S" sender, other says "I" or + , hot wire.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn