i use to run an erl mf2 5th injector unit with a yellow injector on my zvh , I got it the hole lot minus the injector from erl direct it was complete kit with wiring and the pressure switch worked well made 286bhp at 320 foot pound @ 1.5bar on the mfi with obviously various other bits altho getting the fuel distribution correct to all 4 cylinders was an issue , you could run 6 injectors from an erl unit , iff fitted in the crossover pipe your better off running to at different angles .!
altho the only erl web site I can see now is retirement villages (funny how the internet targets you )