i got a tach and all for my 1996 cav 2.2l  and a autometer tach adaptor i found the coils on the back of the engine but which wire do i cut to intall the adaptor it says in the instructions to cut  the pink one but it also says that it might not be the pink one it say i have to look for the coil positive 12v supply wire 
any help would be great '
 
1996 cav 2.2l with medium mods