Disclosed is a device and method of attaching a housing unit, particularly an instrument cluster housing, to an IP retainer without the necessity of attaching the bottom edge of said housing with fasteners such as screws and the incumbent requirement for fastener driver and driver operator access. This achieved by providing at least one snap-in attachment member on the bottom edge of the housing. The attachment member terminating in a mounting pin mounted in corresponding pin mounts provided in the receiving IP retainer.