Looking for a used unit

You are looking for the very old serial port type ?

If it works on a 2002 919 then yes

Yes they do.
They come up rarely these days here on WTers, but there was one last year sometime.
If you don't already have the software, unless you can access the CD, you'll have to get it from Dynojet by means of them directly linking to your computer and installing it for you remotely.

There's more IIIusb ones kicking around, and that software is still downloadable off the Dynojet website if one doesn't have the CD. The IIIusb will go for more $$ than the serial port PC3.

Just get the PCV and be done with it. Smaller unit with more resolution and the same price...

In terms of new out of the box, today's price for a PCV is way less than what my IIIusb was new 15 years ago.
I need to get the manual for the V and read up on it.

My assumption is that his hunt for a 3 is based on the hope of finding one for something like $50.

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