TunerPro User Forum

So I have to run both of those at the same time? Or just one at a time?

I'm looking for an adx file for my 1991 GMC R3500 7.4L 4L80e automatic. I believe the $85.xdf is correct file, but there is no adx to go with it. Is there anything else I need to add? I'm new to tuning and so far getting overwhelmed at the learning curve. I'm still just trying to data log for a whil...