Hello Peter,
Seems i did misunderstood you than because you mention above that you visual saw the switch move when you used that offset.
"I am want connect a switch with FSBus for to Switch off the Fuel Flow to the Engine (FSUIPC Offset Number 0890)
I put the following line in FSIF.ini
2, "Engine1_Left_Fuel_Sw", 509, 0, 0x0890, I16, 1, RW, 10, 1,1,
when I put on the switch I see in MS Flightsimulator that the Fuel Switch visually working, but the engine does not start. "
Guess you didnt see anything happen so that brought me on the wrong track...
I will have a look for you what i can figure out to get that switch moving ..
gr.
Frans M
www.airbus320.nl