PowerLogger installs on the engineering port of the ECM just like Direct Scan did. You don't need anything else for it to work, but, it has an analog connection block that plugs into it and this is where other inputs can connect to it.
If you want to install a wide band, the analog output of the wb goes to the connection block. If you want to log boost, you connect the map sensor to the block. Same with egt, fuel pressure, or whatever. Fuel pressure requires a sender from Caspers or Autometer and it screws into the rail. No gauge is required, it is displayed on the PL log. You could run an electrical gauge if you wanted to.
Wideband can be displayed on the log and thru the scanmaster...o r you can add a gauge as well.
Boost, the same way...SM, PL, and a guage.
Feeding PL into the scanmster speeds up the display rate to five times a second and adds wb, egt, boost, and map to it beyond the normal...if you have those functions and they are wired in.