Abstract: A gear position sensor arrangement to indicate which gear ratio has been engaged in a change speed mechanism. The arrangement includes an indicating formation (19) which is connected with a portion (11) of a ratio selector mechanism of the change speed mechanism which moves in a first linear sense (X) and in a second rotary sense (Y) during selection of each gear ratio, and a sensing formation in the form of a cam surface (28) of a cam (20) which is moved in a third linear sense (Z) as a result of the movement of the indicating formation in the first and second senses to provide an indication as to the currently engaged gear ratio of the change speed mechanism via a linear sensing probe (26).

Abstract: A variable pressure hydraulic system includes a hydraulic pressure source which is selectively connected to a hydraulic system or to drain, via a control valve and a pressure transducer; the control valve in a first position isolating the pressure source from the hydraulic system and connecting it to the pressure transducer and in a second position connecting the pressure source to the pressure transducer and the hydraulic system.

Abstract: A method of determining, during a clutch re-engagement process, the kiss-point of a vehicle clutch (14) having a driven plate (40) which drives a vehicle from an engine (10) via a multi-ratio transmission (12).