Here are some photos Stewart took of his 55 setup. Not clear from your post if you just have a bracket with no electrical components attached or if you have all the components on the bracket but disconnected wires.
If you will confirm exactly what you have and if needed then we can provide some more suggestions. The control switch is a black box bolted to the frame and located a short distance away from the compensator. It will also have 3 wires going to it but the terminal placement will be different depending on if it is the original 55 or was upgraded with a later switch.
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