I'm installing an 18 circuit painless muscle car harness and 8 switch panel in a 71 camaro pro street car. I have everything wired up except i can't figure out how to wire the brake light switch through the turn signal switch on the painless switch panel. I have the signals all working but i can't get them to flash when the brake light are on, the car has the integrated brake and turn signal set up and I've tried everything and i still can't get them to work. Any ideas would be greatly appreceated as i am hoping to have the car finished for the customer by the end of the week.

Thanks