14 point relay is same as i use ,,,,,,,,,,,,,,in change over switch you buy a relay of double point instead of single point ,,,,,,,,,,,,and its coil is 220V instead of 12 V ,,,,,,,,,,,,the one you buy can also be used,,,,,,,,,,,,,i am just suggesting you that it will be batter to use a 14 point 220 V relay instead og 8 point 12 Volt relay,,,,,,,,,,,,you can save some money on 12 Volt transformer with that,,,,,,,,,,,the point is that the 8 point relay only comes in 12V coil ,,,,,,,,,,so batter use 14 point relay of 220 V coil and use its 6 points and leave other blank