The development of thick film rheostat position and pressure senders, including justification, is described. Predecessor wire wound constructions with problems leading to thick film senders are also reviewed.Thick film's advantages of long life and consistency are covered as well as disadvantages. Later, issues relative to function and quality become evident in the data presented. Load conditions covered include environment, cycling, vibration and dither. Specific applications to pressure and fuel senders are described with historical results.Concluding, successful performance of thick film rheostat construction is established. The benefits expected are found validated, particularly with substantially improved service life.