Nice. One of the rules of repairs is don’t add extra things until it’s running right. So now that it is there...
My suggestion is to have a second good pmd on a heateink mounted next to the working one. Put a dummy plug in it to keep the connection clean. Whenever there is issues, you can simply move the wire connection over to the other one and resolve an issue. This is extremely helpful in emergencies and when parts stores aren’t close. Having a spare pmdfor this engine is like having a spare tire. But many folks just leave it in the glove box, a mistake imo.
leroydiesel.com sells lifetime warranty ones. I say plug in and drive on one with a lifetime warranty, and keep the other as the back up unit. When the one fails, you can move the wire over and be on your way. Removing the warranty one at you convenience and ship it back for replacement while the truck still works. Could be on th other side of the planet, you might find a local supplier with the warranty there, maybe not. Either way having a spare readily mounted is the smart move if you keep the ds4 system.