Lectrotab Smart Tabs SX Series 10.5 X 12 f/21-25' Boats Up To 350 HP [SX10512-90]Smart Tabs SX Series 10. 5 X 12 for 21 25' Boats Up To 350 HP If these trim tabs don't provide you with an outstanding performance increase, contact us within 30 days of your purchase. Why buy a manually adjusting trim tab set when you can get the automatic trim tabs that will self adjust and perform better for less money? The SX series incorporates all of the fully automatic features of our popular SMART TABS, in addition to the rust and corrosion