I do not know if you still try to find the solution but I could make it work with that code.
You juste have to replace the "A" with the letter of your joystick and the "3, 2, 7 and 6" with the right button number (3=ENG2, 2=ENG1, 7=IGNI/START, 6=CRANK for me)
cheers
1=PA,3,C67064,0 -{ENGINE_MASTER_2_TOGGLE}-
2=PA,3,C66301,0 -{TOGGLE_STARTER2}-
3=PA,3,C66495,0 -{TOGGLE_FUEL_VALVE_ENG2}-
4=UA,3,C67064,0 -{ENGINE_MASTER_2_TOGGLE}-
5=UA,3,C66301,0 -{TOGGLE_STARTER2}-
6=UA,3,C66495,0 -{TOGGLE_FUEL_VALVE_ENG2}-
7=PA,2,C67063,0 -{ENGINE_MASTER_1_TOGGLE}-
8=PA,2,C66300,0 -{TOGGLE_STARTER1}-
9=PA,2,C66494,0 -{TOGGLE_FUEL_VALVE_ENG1}-
10=UA,2,C67063,0 -{ENGINE_MASTER_1_TOGGLE}-
11=UA,2,C66300,0 -{TOGGLE_STARTER1}-
12=UA,2,C66494,0 -{TOGGLE_FUEL_VALVE_ENG1}-
13=PA,7,C67275,0 -{ENGINE_MODE_IGN_SET}-
14=UA,7,C67274,0 -{ENGINE_MODE_NORM_SET}-
15=PA,6,C67273,0 -{ENGINE_MODE_CRANK_SET}-
16=UA,6,C67274,0 -{ENGINE_MODE_NORM_SET}-