[68c10airstream]

I'll go out on a limb on your momentary switch. If the switch returns to the center and you can toggle it up and down this is my wiring layout;

Ls1 nova's plug in wiring layout applied to your momentary switch would be
Power from fused source (pink) to the center terminal

resume/accel (dark green) go to the next terminal say it's the above terminal in the above illustration

set/coast (dark blue) goes to the lower terminal, say its the terminal below

The key here is the wiring needs to be all in a row, as an example take all the rh terminals on the switch shown, center is power in, upper terminal makes contact with the center terminal when the toggle lever is pushed down, lower terminal makes contact with the center terminal when the toggle lever is moved up..

To sum up the above description power comes into the center terminal and goes nowhere until the lever is moved up or down. When the lever is moved power then comes from the center terminal and goes out to the corresponding terminal as a momentary power signal. Hope this helps.