The magneto switches are local variables (LVARs) and the applicable ones are Left_Lower_Magneto_Left and Left_Lower_Magneto_Right. These can be set to off (0) and on (1) but i am unsure if they can be toggled during a button press. (ie: i suspect when you press the button it will either set it to on or off depending on what you have selected). You could use 4 buttons to set Left on and OFF on two buttopns and Right on and off on two buttons but not sure that is what you are after.

@Martyn
Cool, okay. Thanks for the reply.

A