When the solenoid is closed, the boost valve controls max boost. Connect a solenoid to the Ts so when open, it bybasses the boost valve, giving the stock WG boost limit. To keep the high / low boost selectivity with a boost control valve (Gillis, etc) you can do what I did years ago: Put in the boost control valve, and put a vac T at each end of the valve. Later TCs (87-88) just used the BCS as either on or off. Early TCs dithered the BCS at 40 Hz (Pulse width modulation).
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