A speed sensor comprising: a first portion having: a sensing assembly for generating a signal associated with a movement of an object external to the speed sensor, a plurality of terminals for transferring the signal from the first portion, and a second portion, the second portion having: a wiring harness for transferring the generated signal to a device external to the speed sensor, a plurality of terminals for transferring the signal from the plurality of terminals of the first portion, and wherein the first portion is joined with the second portion to form a subassembly, wherein the subassembly includes a plurality of holes at a point where the first portion and the second portion are joined, wherein one or more of terminals of the first portion are joined to one or more of the terminals of the second portion, wherein a third portion is over-molded over a point of the speed sensor where the first portion joins the second portion, wherein the first portion includes a first housing over-molded over the sensing assembly with first ridges, wherein the second portion includes a second housing with second ridges, wherein the first and second ridges (420, 520) are keyed to enable interlocking alignment of the first and second portions, the keyed portions being shaped to leave windows exposing the terminals (342, 528) when interlocked, the windows being arranged such that a probe may enter the windows to join the terminals together, and wherein the third portion is formed by over-molding substantially at the point where the first and second portions have been joined in this way. a first portion having: a sensing assembly for generating a signal associated with a movement of an object external to the speed sensor, a plurality of terminals for transferring the signal from the first portion, and a second portion, the second portion having: a wiring harness for transferring the generated signal to a device external to the speed sensor, a plurality of terminals for transferring the signal from the plurality of terminals of the first portion, and wherein the first portion is joined with the second portion to form a subassembly, wherein the subassembly includes a plurality of holes at a point where the first portion and the second portion are joined, wherein one or more of terminals of the first portion are joined to one or more of the terminals of the second portion, a sensing assembly for generating a signal associated with a movement of an object external to the speed sensor, a plurality of terminals for transferring the signal from the first portion, and a second portion, the second portion having: a wiring harness for transferring the generated signal to a device external to the speed sensor, a plurality of terminals for transferring the signal from the plurality of terminals of the first portion, and wherein the first portion is joined with the second portion to form a subassembly, wherein the subassembly includes a plurality of holes at a point where the first portion and the second portion are joined, wherein one or more of terminals of the first portion are joined to one or more of the terminals of the second portion, a wiring harness for transferring the generated signal to a device external to the speed sensor, a plurality of terminals for transferring the signal from the plurality of terminals of the first portion, and wherein the first portion is joined with the second portion to form a subassembly, wherein the subassembly includes a plurality of holes at a point where the first portion and the second portion are joined, wherein one or more of terminals of the first portion are joined to one or more of the terminals of the second portion, wherein a third portion is over-molded over a point of the speed sensor where the first portion joins the second portion, wherein the first portion includes a first housing over-molded over the sensing assembly with first ridges, wherein the second portion includes a second housing with second ridges, wherein the first and second ridges (420, 520) are keyed to enable interlocking alignment of the first and second portions, the keyed portions being shaped to leave windows exposing the terminals (342, 528) when interlocked, the windows being arranged such that a probe may enter the windows to join the terminals together, and wherein the third portion is formed by over-molding substantially at the point where the first and second portions have been joined in this way.