You can't connect directly a Simscape PS signal with a Simulink signals. You need to put a sensor to pass to a physical signal and after a PS-Simulink block to pass a Simulink signal. I don't know if the circuit is correct but I attached one picture with the connections.
you need a block, the simulink uses different kinds of signals, for example the simulink uses arrows, in simechanics the terminals are circles, and in the simscape they are the tringles that you cannot connect, you need to put a voltage or current sensor