it still works on the same principal as a normal 1.2, its still got a coil on the side of the engine bay, there should be wires from it, all you will have to find out is whats the + and whats the - and the tap into the + and bring it to youre rev counter
You have to connect the rev counter to the coil, as it is connected on the following picture (to the white cable with a red stripe)... remember that if you are using the whole gauges (i dont know if that is the right word) from the SuperS you have to connect the rev counter thru the 2.2kOhm resistor... have phun