Joystick for outdrive, buttons for left tab & right tab? Just a guess since we don't know where they are hooked to, but it would make sense that way.
OR
Old set of tabs had the buttons and a new set of tabs had the joystick, and the previous owner didn't want a hole in the dash so he just left the buttons there, disconnected.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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