both of you guys have no idea what you are talking about.
by the nature of it cng wants an advance spark relative to petrol, the advancer does that, it advances the spark. the unit used to advance is degree of crank. it can be used in any petrol car, no matter carby or efi, distributor one or DLI one. tps is only used to point out a range where the advancing is done.
on the other hand emulator is used to cut of the signal to the injector, thats it.. the fuel rail remains pressurized only the injectors are disconnected, this can also be done by a simple relay. only in efi cars, as is carby ones there are no injectors.