I am putting my car together and Electronics isn't my thing but I always seem to get it done.

In lamnents terms: Hondata s300 v2 with hondata mac solenoid:
1 wire goes to A11
+12v, 1 wire go to constant in below pic of fuse panel under dash? or no better way?

Thanks

 

You can get power from anywhere honestly. It wont activate unless the ECU switches the ground on. But the best answer would be from ignition.

 

Sounds good so use ignition prong/inlet on fuse panel in dash in the above pic.

 

Affirmative