RJC boost controller

1986 Buick GX1

GX1 #001 [The One and Only]
I'm not familiar with the H/A, but don't use the stock boost control stuff (which I'm sure you know) and connect the hose from the turbo to the straight end of the RJC. Go from the 90* end on the RJC to the wastegate actuator bypassing all other vacuum hoses.

If there is more than one spigot on your wastegate actuator then disregard this post and listen to the next guy.

1986 Buick GX1

GX1 #001 [The One and Only]
Ooh, yeah. Sometimes I should just keep my mouth shut. Lol
Are the two spigots connected (internally) or are they on opposite sides of the diaphragm?

I would start by testing. Disconnect both lines on the wastegate. Pressurize the spigot that goes to the manifold and see if the wastegate moves or if air blows out the other spigot.

If the wastegate moves discard or just leave the hose that goes to the stock solenoid (boost controller) disconnected and install the RJC boost controller in the line that connects to the manifold.

If air blows out the other spigot, cap it off and see if the wastegate moves.

Sorry I can't say, yeah, do it this way. Maybe we can get it figured out.