1101,
Kind of depends what it is that you want the connection to do...
The Goldline GL-235 Solar Controller has two outputs... The standard 24/VAC to drive the valve actuator... and one Normally Open switch contact to drive a booster pump..
If your goal is to have the SuperFlo VS come on or increase speed when the solar valve comes on AND there is no booster pump then you can do the following..
Wire the five volt pump output to the input side of the booster pump connection on the GL-235.
Wire the output of the booster pump connection to one of the input wires on the Pentair cable.
The pump will run as scheduled until the Solar heat is turned on by the GL-235.. Then, the five volts from the pump will pass through the now closed booster switch and back to the pump, telling the pump to run at whatever speed you have set up.
Thanks,
Jim R.