Which flywheel are you using? The zetec block has a hole for mounting a CPS. Would it not just be a better idea to fit an OEM 36-1 flywheel and sensor package which you know will be reliable rather than bodging some aftermarket/homebrew solution? The Burton trigger wheel kit is for a CVH pulley, not Zetec. Also, the ZVH engines you've seen with a trigger on the cam pulley is most likely for engine phase, not crank position. You will need this if you intend to run the ECU in sequential fuelling mode (as well as a crank trigger).