Sadly, six pin port.
I have looked at the Scangauge D and it seems like a likely future purchase.
I came across https://copperhilltech.com/blog/moni...r-arduino-due/
which talks about monitoring with an arduino and a fancy max485 module with five pins instead of four. I ordered a cheap one, I'll see if I can break out the pin that they didn't connect and slap together the J1708 circuit as in https://copperhilltech.com/a-brief-i...708-and-j1587/
... I have everything I need, in storage of course.
Is there any chance I can connect more leads to my PCM and get CAN?