Yup, that's all you need - I converted my DST from yoke to DIN just a few weeks ago.
You'll need a large adjustable wrench (we call them shifting spanners in Australia, dunno what they're called over here - monkey wrenches?) to remove the yoke, and a hex-key (6mm I think? same as the port plugs) to screw in the DIN fitting. Removing the yoke is a PITA finding a large enough wrench that will fit around the yoke, and grip on the nut with the filter in the middle of it, that holds the yoke connection to the regulator body. Make sure you get one that fits properly so you don't damage the yoke or the reg. I think it's lefty loosey, but check the thread direction on the DIN converter once you get it. Mine was very stiff to undo the first time, but it was easy to screw in the DIN fitting once the threads had released. I removed all of the hoses from the regulator so I could get a better grip on it - if you have a bench vice you can line with some soft pine and rags to grip the regulator body, it should be easier. Be careful not to apply much pressure to the swivel turret while undoing the yoke connection.
Make sure that there are TWO o-rings with the DIN converter - there should be a small (size 011 I think - same as the one on the inside end of the yoke connection if it's missing) o-ring on the end of the DIN converter that goes into the regulator body, holding a very fine conical filter/screen in place, as well as the normal external o-ring that goes into the tank valve. I reused the one off the yoke connection because it was nearly new anyway, and I didn't have any O2 lube to keep my reg nitrox compatible.
Leave the plastic spacer on the outside of the regulator body in place. It will be looser than it was with the yoke connection, but that's okay, because the DIN fitting has to be able to spin freely so you can do it up on a tank valve.
Ben
