An electrical connector having no glass seals, while having a single electrical conductor embedded in a thermoplastic body, with a section of the electrical conductor also being enclosed within a insulating ceramic bushing, wherein the electrical conductor has an enlarged diameter portion sized to allow the enlarged portion to sealingly engage one end of the ceramic insulating bushing, wherein such engagement prevents the extrusion of the thermoplastic body along the electrical conductor through the interior of the insulating ceramic bushing. Alternative embodiments include electrical connectors having multiple pin electrical conductors and downhole sensors.