taper pins are preferably fabricated from a plastic material such as nylon which will provide sufficient friction for holding them in the tapered holes and have suitable resistance to wear encountered from repeated usage the taper pins not only clamp the bare end of the lead wire 96 from the sensor into good electrical contact with the copper slug 51 but also clamp the insulation 57 of the lead wire by the wedging action at the general area 58 the insulation is stripped from the wire from approximately the point 59 to the end of the wire 60 this multiple clamping action on the lead provides excellent mechanical support and greatly decrease the breakage of the lead wires this unique design also provides for the actual electrical junctions 61 between the sensor lead wire and the copper slug to be uniformly made in all the junctions at substantially the same depth location in the copper slug junction blocks when the pins are inserted into the slugs until the bottom of the taper at the top of pin seats 62 at the bottom of the countersink of the copper slug the relatively large head 63 and the taper 67 at the top of the pin provides easy removal and insertion of the pin into the bore of the slug the countersink 53 at the top of slugs also provides easy insertion of the pins also a slight taper 64 in the lead wire hole of the pin also facilitates easy insertion of the lead wire and.