I've been looking into a gear vendors unit, however, nothing I have read has said how you go about shifting. Can it be full auto? Do you have to hit a switch between every gear (i.e. 1st, hit button to 1 1/2, shift lever for 2nd, button for 2 1/2, shift to 3rd, button to 3 1/2)? I have searched the archives and have not found anything on the actual operation of the unit. People seem to love them and it seems like a better alternative than an OD trans swap, but...how do you shift it?