In this paper, the projective function synchronization of chaos between two gyroscope systems with distinct behaviors is investigated under sinusoidal constraints. The objective of the research is to adjust a current gyroscope system to the idealized behaviors in design through synchronization. From the theory of discontinuous dynamical systems, the mechanism of function synchronization of chaotic motions is studied. The analytical conditions for the function synchronization are achieved, and the invariant domain of the function synchronization is obtained. Numerical illustrations for partial and full, projective function synchronization of two gyroscopes with different dynamical behaviors are carried out. The scaling factors in such function synchronization are satisfied through numerical results.