RoadkingC6

I have the Avic 940BT in my car, I have a 2005 Corvette with a digital speedometer and a HUD in the car, the problem is my speedometer is not registering the speed on the dash or at the HUD unit, the tach and other functions are good, i had the Pioneer installed at P.C. Richards over a year ago and everything was fine until recently, i have searched the Pioneer disc on the computer to find the wiring diagram for installing the unit to the car, however the disc only shows how to use the radio functions, my questions are where can i get a wiring diagram showing the radio, speaker and all connect

Yea I agree, that little knob is a pain, what else is available for that and where do you order something, can't understand why they didn't use a volume bar on the screen