Franco, here's shot of mine...
I couldn't recommend it any higher...it's a Minn Kota 74 lb thrust 24 volt auto-pilot w/co-pilot...just after I got this one, MK upgraded to 80lbs of thrust...for a 20'er this is what you'll need for sure...friend of mine went cheap and tried to get away w/a 12 volt version... ::) :P...WEAK and his is onna 17'er...if you're gonna do this, plan on two group 31 batts DEDICATED to nothin' but the TM...AND an on-board charger to heat 'em back up after a hard day of chasin tail...fish-tail, that is!!!...Installed a Guest 2620 in 1999...FLAWLESS...plug in and FORGET about it til you're ready to go... ;)