Really, unless you know what was there before, or what was controlling it...there is no sense guessing.

You need to find out if the ecu was controlling boost in the past or if someone had fitted a boost controller that is no longer there etc etc. But the simple/easy thing to do is use the ecu to control boost, although obviously this will need setup/tuned within the ecu and the engine tuned at all boost levels you will use.
If for whatever reason that is not possible, there are dozens of aftermarket controllers on the market, although most will come with a new valve anyway. The connector etc on yours does look more akin to a Greddy unit.

Connection here shows for a typical 3 port MAC valve. As to whether numbering on your valve is identical, would be up to you to determine. Ignore the block off unused port part. 2 port internal actuators like that arent that common anyway.