car has had a manual boost controller from when I got it, now have power fc and the 3 port solenoid is still on car, would it be worth re-connecting it and can I set boost level with commander?

 

assuming you are on a 92~96 car as you mention 3port solenoid and they only fitted to those years as standard then no.. as the standard map sensor will only allow boost control to 1bar officially.. can play and get it higher than that but easier to use manual boost controller assuming it works fine.

Simon