Pressure sensing apparatus with temperature compensation

Pressure sensing apparatus (14) comprises pressure responsive means (4) and hydraulic connecting means (11, 12, 13) hydraulically connecting the pressure responsive means with pressure sensing means (5, 9) which produces an indication of sensed pressure. The hydraulic connecting means comprises a tubular member (11) and a longitudinal insert (12) in the tubular member with hydraulic fluid in the tubular member between the insert and the member, the tubular member, the insert and the hydraulic fluid and the dimensions of the tubular member and the insert being such that the pressure transmitted to the sensing means in use of the apparatus is substantially independent of temperature changes.