84 to 87 wiring issues

[bswanmi]

Hi, I just finished a restoration of an 84 GN and installed an 87 engine, engine harness and computer. Of course there is no provision for the hydraboost brakes or the fans in the 84. Has anyone come up with a good work-around for this problem? Any ideas will be helpful.
Thanks

 

[bswanmi]

Correction: I used the wrong term for the brake system I am trying to install... it's the powermaster not the hydraboost. Both the fans and the powermaster use the same brown wire that needs to be at 12v when the ignition is on and it is not. Since I am not using the air conditioner I thought I might use a wire from that but I don't know how to find the proper wire.