|I can supply the trigger wheels; the alloy pullies are just the OEM Lotus pulley modified to accept the trigger wheel - you need to cut a small rebate on the rear of the pulley, I make the trigger wheel and pulley a slight interference fit. Then there are 3 small holes to drill and tap into the pulley - the trigger wheel is fixed with countersunk M4 screws - I also like to bond it to the pulley to be 100% sure it isn't going anywhere. It is simple stuff for an engineer. I can sell you a trigger wheel for £25 plus postage. I have two versions - one as shown and one with angled teeth, to allow for a sensor set at an angle like the photo below.
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