I am sure you could do the single light to indicate lean burn. It has talked about many times but nobody ever posted exactly how to do it. I took the easy way and bought the autospeed kit.
The only imput besides positive and negative is pump cell positive which is D14 at the ecu.
I don't know about the HX motor but going into leanburn on the Vx is really super easy .
And the mpguino is super accurate for a leanburn motor. All the data that the scanguage provides is nice but you really don't need it for leanburn ,at least not in a vx.