The controller i made mounts inside the cabin where the fuses/diagnositic connector is....it has two led's on it a red and a green ....so when the ign is turned on the unit powers up(red led)and when it switches the fan on the green led lights up.....it has an input wire(from the temp gauge....(i snaffled in to it from the plug in the dash cluster)a positive,an earth and the output wire(to fan relay)so no added senders/thermoswitchs needed)I also used the original fan relay....so if you looked at the car....it all looks original.....i used EF falcon fans....even they look original!