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In some embodiments, an apparatus includes a target member, a sensor and a mounting assembly. The target member is coupled to a shaft that is disposed within an engine housing and that rotates about an axis. The target member includes a target surface that is substantially normal to the axis of rota

In some embodiments, an apparatus includes a target member, a sensor and a mounting assembly. The target member is coupled to a shaft that is disposed within an engine housing and that rotates about an axis. The target member includes a target surface that is substantially normal to the axis of rotation of the shaft. The sensor is configured to produce a signal associated with a distance between a sensor tip and the target surface. The mounting assembly is coupled to the sensor and the engine housing, and is configured to adjust the distance between the sensor and the target surface.

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1. An apparatus, comprising: a target member configured to be coupled to a shaft, the shaft disposed within an engine housing and configured to rotate about an axis, the target member including a target surface substantially normal to the axis, wherein the target member is configured to be removably

1. An apparatus, comprising: a target member configured to be coupled to a shaft, the shaft disposed within an engine housing and configured to rotate about an axis, the target member including a target surface substantially normal to the axis, wherein the target member is configured to be removably coupled to the shaft;a sensor configured to produce a signal associated with a distance between a sensor tip and the target surface; anda mounting assembly configured to be coupled to the sensor and the engine housing, the mounting assembly configured to adjust the distance. 2. The apparatus of claim 1, wherein: the sensor is an eddy current sensor; andthe target surface is constructed from a conductive material. 3. The apparatus of claim 1, wherein the sensor is a first sensor, the signal is a first signal, the apparatus further comprising: a second sensor configured to produce a second signal associated with a distance between a sensor tip of the second sensor and the target surface, the second sensor disposed circumferentially opposite the first sensor. 4. The apparatus of claim 1, wherein the mounting assembly includes a first adjustment portion and a second adjustment portion, the first adjustment portion configured to adjust the distance over a first range, the second adjustment portion configured to adjust the distance over a second range. 5. The apparatus of claim 1, wherein the mounting assembly includes a first adjustment portion and a second adjustment portion, the first adjustment portion configured to be adjustably coupled to the engine housing, the second portion defining a channel within which the sensor is configured to be slidably coupled. 6. The apparatus of claim 1, wherein the mounting assembly includes a first adjustment portion and a second adjustment portion, the first adjustment portion configured to be adjustably mounted within a channel defined by the engine housing, the second portion configured to be adjustably coupled to the sensor. 7. The apparatus of claim 1, wherein the target member includes a first portion, a second portion, the target member configured to moved between an expanded configuration and a collapsed configuration, the second portion is spaced apart from the first portion when the target member is in the expanded configuration, the second portion in contact with the first portion when the target member is in the collapsed configuration. 8. The apparatus of claim 1, wherein the target member has a balance surface opposite the target surface, the balance surface being tapered. 9. An apparatus, comprising: a target member configured to be coupled to a shaft, the shaft disposed within an engine housing and configured to rotate about an axis, the target member including a target surface and a balance surface, the target surface substantially normal to the axis, the balance surface opposite the target surface, the balance surface being tapered;a sensor configured to produce a signal associated with a distance between a sensor tip and the target surface; anda mounting assembly configured to be coupled to the sensor and the engine housing. 10. The apparatus of claim 9, wherein the balance surface includes a balance mass coupled thereto. 11. The apparatus of claim 9, wherein: the sensor is an eddy current sensor; andthe target surface is constructed from a conductive material. 12. The apparatus of claim 9, wherein the mounting assembly is configured to adjust the distance. 13. The apparatus of claim 9, wherein the mounting assembly includes a first adjustment portion and a second adjustment portion, the first adjustment portion configured to adjust the distance over a first range, the second adjustment portion configured to adjust the distance over a second range. 14. The apparatus of claim 9, wherein the mounting assembly includes a first adjustment portion and a second adjustment portion, the first adjustment portion configured to be adjustably coupled to the engine housing, the second portion defining a channel within which the sensor is configured to be slidably coupled. 15. A method, comprising: disposing a target member about a shaft of an engine such that a target surface of the target member is substantially normal to an axis of rotation of the shaft, the shaft configured to be disposed within an engine housing;coupling a sensor to the engine housing, the sensor configured to produce a signal associated with a distance between a sensor tip and the target surface, wherein the coupling includes coupling the sensor to the engine housing via a mounting assembly; andadjusting a position of the sensor to change the distance, wherein the adjusting includes at least one of moving a first adjustment portion of the mounting assembly within a housing channel defined by the engine housing and moving the sensor within a mounting channel defined by a second adjustment portion of the mounting assembly. 16. The method of claim 15, wherein: the sensor is an eddy current sensor; andthe target surface is constructed from a conductive material. 17. The method of claim 15, wherein the sensor is a first sensor, the signal is a first signal, the method further comprising: coupling a second sensor to the engine housing such that the second sensor is disposed circumferentially opposite the first sensor, the second sensor configured to produce a second signal associated with a distance between a sensor tip of the second sensor and the target surface, the second sensor disposed circumferentially opposite the first sensor.