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A boat leveling systems with a pair of trim tabs pivotal between a horizontal position and a downwardly inclined position. Each trim tab is actuatably between the horizontal and inclined positions by a separate fluid motor which includes a cylinder, a piston slidably disposed in the cylinder and a r

A boat leveling systems with a pair of trim tabs pivotal between a horizontal position and a downwardly inclined position. Each trim tab is actuatably between the horizontal and inclined positions by a separate fluid motor which includes a cylinder, a piston slidably disposed in the cylinder and a rod connected to the piston. The position of each trim tab is indicated by apparatus which includes a linear potentiometer attached to the rod of the associated fluid motor, the potentiometer having a flexible plastic envelope and a pair of normally spaced-apart conductive strips sealed in the envelope, a ball and spring carried by the cylinder for contacting the envelope and forcing the strips into electrical contact with each other, and a resistance measuring device connected in circuit with the potentiometer and to provide a readout in degrees of the downward angle from horizontal of the trim tab.

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A trim tab positioning assembly for a boat having a transom comprising a trim tab connected to said transom by a hinge, an extendible fluid motor, the fluid motor having a cylinder member directly pivotally connected to said trim tab on one end, a piston slidably disposed in the cylinder member and

A trim tab positioning assembly for a boat having a transom comprising a trim tab connected to said transom by a hinge, an extendible fluid motor, the fluid motor having a cylinder member directly pivotally connected to said trim tab on one end, a piston slidably disposed in the cylinder member and a rod member connected to the piston and directly pivotally connected to said transom, position indicating apparatus comprising a linear potentiometer having a flexible plastic envelope and a pair of normally spaced-apart conductive strips sealed in said envelope, a longitudinally extending slot formed in one of said members and said envelope being disposed in said slot, means carried by the other of the members for contacting said envelope and forcing said conductive strips into electrical contact with each other, and resistance measuring means connected in circuit with said conductive strips.