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APU STARTER 66704
APU OFF SWITCH 66705
PMDG Event : Nr. 118 :::::::: Name. EVT_OH_LIGHTS_APU_START ::::::::: EventID. 69750
For Parameter check the Output :
64FB 1 BYTE APU_Selector 0: OFF 1: ON 2: START
That is possible.
If you switch the button ON in MF then configure the tab ON PRESS. With your example you switch the taxi lights ON.
When then switching to the other direction you have to config the tab ON RELEASE - in your example taxi lights OFF.
No signal ist not possible because the MEGA does not have tri-state inputs. The firmware of MF activate to every pin so called pull-up resistance (built in the chip) to +5V.
If you switch you put GND to the pin and if you release you have +5V via the pullup on the pin. So the pin never is open.
This is done to have no indifferent voltages at the input and the data signals have defined levels.
I think we both mean the same, but I was so free to explain it to you technically.
SPST switches are possible if they have three poles where the middle one is for GND.