Sorry for the repost, had to fix something in the posting.
Initially when I purchased the DDM turbo, I had planned to leave it at the default boost, with a stock engine, it just wasn't advised to go any higher, or not much higher. However, when the gen 3 engine was installed and it built out, I have a lot more leeway on how much I can shove at it.
So, a boost controller has been installed. Dave suggested I go with the Innovate SCG-1 so that I get AFR, Boost pressure and a controller. Not only will it control your boost, but if o2 or AFR get out of set bounds, it will cut boost and go back to spring pressure. A nice safety feature in my mind.
This pic isn't with the engine on, didn't grab one when I had it on and then took things apart to work on stuff, LOL. My triple gauge setup had a voltmeter, that I didn't need, since I have one in the glove box, so it was removed and the SCG-1 was installed. It doesn't quite match the other two, but meh, it's functional and that's more important. Link to the manual
Installing it isn't too bad, gotta tap into a vacuum source for your Map sensor, and just running wiring for the Map sensor, o2 sensor and the solenoid to the gauge.
I will warn that it's easy to get the solenoid vacuum connections wrong, and you could cause a problem on the engine/turbo if you don't connect it correctly. I've tried to detail this to make sure and help others out if they tackle this.
The below pic shows where I installed the items. The red marking is the Map 4 sensor, the manual says that the vacuum input has to be at the bottom, so it needs to be mounted vertically. The blue marking is the vacuum solenoid and the green marking is the o2 sensor for the controller. Dave had installed another bung in my down pipe for this. The controller comes with one, and if you don't have a spare, gotta have one welded on. This has to be down from the turbo, can't be before it. Many headers have a spare bung, but we can't use it.
The Map sensor needs a vacuum input, I used the lower one on the intake manifold, Innovate supplies a T connector so you can easily tap into a vacuum line.
I have after pictures on all of these, but read through the manual, do not install the o2 sensor into the bung yet, leave it out and ready for testing and calibration. Once you do that part, you can install it into the bung.
Link to the manual again
This is the page from the install manual on the solenoid install. The stage 2 turbo I have uses an internal wastegate.
Port 2 needs to go to the wastegate actuator. port 3 needs to go to the vacuum source on the turbo, and port 1 on the solenoid is plugged (comes with it).
This is a top view of the turbo. The actuator is on the bottom of the turbo, it basically moves a rod to open/close the wastegate that is inside the turbo. The Turbo likely has a vacuum line running from the turbo down to the actuator, this will need to be removed and new lines run from your solenoid to the turbo.
Here is another view of the turbo before it was installed. You can see that I rotated the picture, so that it's in the same top/down view as the above one, to help you with orientation and showing the vacuum lines. This is a better view of the actuator in the back. As you notice, there is another vacuum input at the bottom of that pic, that is the one that goes to the intake manifold for vacuum source, but for the purposes of our boost controller setup, we don't touch it on the turbo.
After everything is connected, you can power up, test the o2, calibrate, and then install the o2 into the downpipe.
If you are not familiar with AFR and boost controllers, I highly suggest you seek the help of a professional, you don't want to take a chance with your engine by goofing something up. I highly recommend you consult Dave, he knows this controller very well and can advise you on programming it safely.
I'll answer any questions that I can, but I may have to refer you