A jaw-mounted magnet accessory is provided for being coupled to a caliper measuring jaw. Also described are approaches for making the package. The vibrator also includes at least one removable end cap for closing any open ends of the housing. The engine controller also receives signals from a mass air flow sensor, a manifold air pressure sensor, a crank angle sensor, a camshaft angle sensor, an oxygen sensor in the exhaust stream and a transmission controller. The mounting plate assembly includes a spring mechanism configured to engage the socket and a wedge block configured to receive the wedge. Once the puncture needle has performed its function, it can shoot back into the device such that there is a reduce likelihood of needlestick injury.