Yeah, cause when I think about it, right now the MS 2 in my car is outputting everything through the BT adapter to my laptop, and my laptop is talking to the ecu back. So what I'd need is a hardwire "display only" coming off of rpi ( hopefully through USB) and a second USB for the interconnect to the Ecu, and finally a 3rd USB to allow the keyboard to control all of this.
(Course you just answered my edit) this may all be blather)
(Course you just answered my edit) this may all be blather)