Which smart tabs?

I have an explorer 21tv with a Suzuki 140 on it, and I'm convinced I want a pair of smart tab sx. I have looked at all of the smart tab tables and it shows to get the sx9510-80 for my boats size but for the motor hp it says to get the sx9510-60! Is there a big difference in the 2? I just don't want to purchase the wrong size.





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