A tire pressure sensor assembly including a valve stem that can be preassembled and snap installed into a tire rim is disclosed. The tire pressure sensor assembly includes a valve stem and a printed circuit board configured with electronics for sensing tire pressure and transmitting radio frequency data related to tire pressure. The circuit board is rigidly connected to the valve stem. The valve stem and the electronics are contained in a unitary, integrated housing that is deformable to allow the valve stem portion of the assembly to be press fit into the rim opening. So installed, the assembly is securely mounted to the rim, but is no more time consuming to install than a conventional valve stem.