LENCO TRIM TAB RETRO KIT Convert From Hydraulic to Electric - 12 Volt Actuator Bennett Hydraulic-to-Lenco Electric Conversion and Performance Upgrade Kits are designed as a direct replacement for the Bennett hydraulic power unit (HPU) on systems using Bennett 4-ring standard trim tab actuators. The simple Bennett RetroFit Kits include everything necessary to upgrade your current boat without drilling or filling. You simply discard the hydraulic pump unit and the two Bennett cylinders. Connect the new actuator wiring to the existing harness (jumper wires are included for attaching to current switch). Complete installation instructions are included.