
firstly what is the size of trigger wheel used on ford crossflow? (inner hole diameter and out diameter)
A photo of installed one would be helpful.
In theory one could make one at home but it would be time consuming (drilling 36 holes) and the balancing so who/where is the cheapest source to
buy?
TAI.
Triggerwheel.com 
Ebay, search for megasquirt, triggerwheel is about £20 on buy-it-now
Have a look in PaulF archive He was very helpful for me and has some very good photo's
quote:
Originally posted by se7ensport
Ebay, search for megasquirt, triggerwheel is about £20 on buy-it-now
Triggerwheel.com
Not the prettiest but effective - see here (Go to Engine/ECU, then external crank
trigger wheel)
Wyn
1.8 cvh sierra, thats what I've used, dead easy to get off as well, right at the front.
Regards
Rich
I used a wheel from a 1.8cvh also , mounted it on an alloy pulley but it could be welded to a steel front pulley easily.
Paul.
If you get a trigger wheel one get the bigest you can. also i remember reading that some welded ones are coming off so im gonna drill and tap mine on.

I got mine new from a Ford dealer - for the price it wasn't worth trying to find one in a scrappy. Can probably dig out the part no if you want it.