Bennett trim tab pump. Self contained with solenoids under the smoked cover and no external relays. Dash switch for trim tabs tell pump where to send the fluid to the tabs and how.
There are check valves under the solenoids (they just unscrew) that do get gummed up and mess up the operation. Lots of videos on youtube to show that and how to clean.
Mercruiser Drive tilt / trim pump. All relays are on the bracket. Pump rotation dictates up or down. Dash switch for drive tilt tells pump to raise or lower.
