Novel P-chirogenic organophosphorus compounds of general formula, a process for the synthesis of the compounds of formula, and intermediate products of general formulae, and, as shown below, are involved in the synthesis of compounds. A nucleus of compressible elastomeric material is surrounded by a winding of a slender strand of flexible tension-bearing material oriented at a pitch angle relative to a central axis. A conductive component is connected to the ground plane through the fuel level sensing assembly circuit.