An apparatus for measuring pressure comprising: a housing having a housing wall (103, 104, 105); an actuator having a shaft extending along an axial direction from a first end of the actuator to a second end of the actuator, the actuator configured to be pressure sealed to the housing wall (103, 104, 105), in pressure communication with a volume (114, 116, 190) enclosed by the housing wall (103, 104, 105), wherein the volume (114, 116, 190) includes a pressure chamber (114, 116) having a chamber wall comprising at least a portion of a deformable member configured to separate the volume (114, 116, 190) into a first chamber and a second chamber, where at least one of the first chamber and the second chamber are in pressure communication with a pressure source, and to be displaced at least partially in the axial direction upon a change in pressure in the pressure chamber (114, 116), wherein the volume (114, 116, 190) has a measurable pressure adjacent the first end of the actuator, wherein the actuator is attached to the deformable member adjacent the first end of the actuator, wherein the actuator is configured to be displaced at least partially in the axial direction upon a change in pressure in the volume (114, 116, 190), wherein the actuator is configured to transfer axial motion from the deformable member to the shaft, wherein the actuator comprises a rigid push plate secured to the deformable member adjacent the first end of the actuator, and wherein the deformable member is pressure sealed to the push plate; the shaft having a magnetically encoded target (208, 501) configured to be detected by a static sensor (140, 200) by detecting axial displacement of the magnetically encoded target (208, 501) relative to the static sensor (140, 200) upon the change in pressure in the volume (114, 116, 190). a housing having a housing wall (103, 104, 105); an actuator having a shaft extending along an axial direction from a first end of the actuator to a second end of the actuator, the actuator configured to be pressure sealed to the housing wall (103, 104, 105), in pressure communication with a volume (114, 116, 190) enclosed by the housing wall (103, 104, 105), wherein the volume (114, 116, 190) includes a pressure chamber (114, 116) having a chamber wall comprising at least a portion of a deformable member configured to separate the volume (114, 116, 190) into a first chamber and a second chamber, where at least one of the first chamber and the second chamber are in pressure communication with a pressure source, and to be displaced at least partially in the axial direction upon a change in pressure in the pressure chamber (114, 116), wherein the volume (114, 116, 190) has a measurable pressure adjacent the first end of the actuator, wherein the actuator is attached to the deformable member adjacent the first end of the actuator, wherein the actuator is configured to be displaced at least partially in the axial direction upon a change in pressure in the volume (114, 116, 190), wherein the actuator is configured to transfer axial motion from the deformable member to the shaft, wherein the actuator comprises a rigid push plate secured to the deformable member adjacent the first end of the actuator, and wherein the deformable member is pressure sealed to the push plate; wherein the volume (114, 116, 190) includes a pressure chamber (114, 116) having a chamber wall comprising at least a portion of a deformable member configured to separate the volume (114, 116, 190) into a first chamber and a second chamber, where at least one of the first chamber and the second chamber are in pressure communication with a pressure source, and to be displaced at least partially in the axial direction upon a change in pressure in the pressure chamber (114, 116), wherein the volume (114, 116, 190) has a measurable pressure adjacent the first end of the actuator, wherein the actuator is attached to the deformable member adjacent the first end of the actuator, wherein the actuator is configured to be displaced at least partially in the axial direction upon a change in pressure in the volume (114, 116, 190), wherein the actuator is configured to transfer axial motion from the deformable member to the shaft, wherein the actuator comprises a rigid push plate secured to the deformable member adjacent the first end of the actuator, and wherein the deformable member is pressure sealed to the push plate; the shaft having a magnetically encoded target (208, 501) configured to be detected by a static sensor (140, 200) by detecting axial displacement of the magnetically encoded target (208, 501) relative to the static sensor (140, 200) upon the change in pressure in the volume (114, 116, 190).