Although it may look tempting it is not always that straight forward.
The chip that plugs into the J3 port is probably OK for the Mustang.
I wouldn't run it in the UK due to the difference in fuel and probably other things as well.
Eventhough there are some successful convertions with the ZT i wouldn't say the same applies for the 75
As always it takes someone to take the plunge but the fact that Sean and Brian stayed clear of it is a good indicator.