A replacement kit for replacing an electrical device coupled to a vehicle via a plurality of vehicle lead wires. The sensing unit enables fluid communication between the sensors and the fluid in the duct through a single insertion point in the duct. A quantity of adhesive material can be applied to the projection to form an attachment structure, and the adhesive material can be connected to a microelectronic substrate with the attachment structure providing no electrically conductive link between the microelectronic substrate and the support member.