For those with MDC controlled instruments, don't forget to CAREFULLY remove the speedo hoses from the MDC before it freezes! The hoses can get stiff around the hose fitting at the MDC & tends to break off if not careful when removing. However hoses that are left on will trap any moisture in the sensative pressure transducer & will crack from freezing. Some have added Tee fittings (1/8" ) with short pieces of hose that is removed or capped so the MDC doesn't have to be disturbed.