This adapter and a laptop with forscan
https://a.co/d/3l4uFeJ
+1 on forscan. It can do an injector buzz test, disable each cylinder, and monitor any PIDs you might need. I just grabbed the cheapest Windows netbook I could find and got the OBD2 adapter, that’s my scanner. On a daily basis, I use a Scangauge, but it only pulls general codes and isn’t reliable for specific info.
@Marcus
Gotcha. Does it need to be an old Windows computer to work properly? Or could it be a newer one? I’m thinking about shopping around.
Clay said:
@Marcus
Gotcha. Does it need to be an old Windows computer to work properly? Or could it be a newer one? I’m thinking about shopping around.
As far as I know, it can be newer. Mine’s running Windows 11. Check out https://forscan.org for more info and to download.
@Marcus
Perfect, I appreciate it. 
Anytime! That’s like my dream truck, by the way! Late 7.3, CCLB, one day I’ll get there. Hopefully black, and a dually with a manual! Enjoy yours and take care of it. These older trucks are worth holding onto. I wouldn’t bother with a new one…
How many miles does she have? Looks like a great rig.
Jory said:
How many miles does she have? Looks like a great rig.
Appreciate it, buddy. 350k.
Oh, she’s a beauty.