Precise pressure monitoring is essential in many manufacturing and processing sectors. A single instrument cannot be used if the required pressure range is too wide. Additionally, pressure measuring instruments may be sensitive for small pressure changes and insensitive to temperature over a range of operating temperatures. Excellent electro-mechanical properties of single crystals and ceramics are guaranteed by the well-known chemical inhomogeneity of relaxor-based solid solutions, which makes such materials potentially appealing for the development of high-efficiency sensors. The Curie-range temperature insensitivity of relaxor ferroelectric can be exploited to create devices whose output is not affected by temperature fluctuations. In the present investigation author studied the temperature and pressure dependent dielectric properties of Lead Magnesium Niobate-Lead Titanate-Lead Magnesium Tungstate Relaxor (PMN-PT-PMW) system by varying the composition of PT and excess Tungsten Oxide (WO3). This study leads to use of PMN-PT-PMW relaxor for high pressure sensor up to 415 MPa.