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I put the larger unit on my Tracker with a 40 HP Jonson.
It's beefy! The only issue is it tends to scoop up water from between the transom and the bracket.
At 20 Knts a little water is rolling up into the splash well. It shoots up about a foot.
If the engine case is not sealed, things could get wet back there. I have never had a problem.
The good price is about $500 used. I found one for $250 on CL complete with relays and switch.

Happy hunting

Karl