No, the dealer is not responsible for that.
You can get those cables at Radio Shack using the part numbers 273-1717/273-1776 for the power supply and tip adapter, and 26-117 for the serial cable.

You can try setting the factory hp tune shift pressures to see if it helps, but there is no power gain ...

Hey Mike, just wondering here.....could the problem be with the 87 tune and can i uninstall that then adjust the shift firmness on the stock tune? I would like to have the tune in it but with it shifting so hard i am afraid something is going to break. I looked at the instuctions for sending you a ...

I sent gary@diablosport my tune this evening I was just wondering if you guys had had any success with the updated tunes for your trucks yet? I am sorry,but no, i have been so busy lately with work and helping neighbors with stuff that i havent looked into the complicated instructions to send in a ...

We can try writing you guys a new custom tune to address these issues.
Send me your original backup file with a list of mods to the truck and I'll get you taken care of.

Thanks Thanks for the response. Although i didnt recieve an email from you saying how to get the orignal file to you. Do i have ...

Just downloaded the 87 performance tune 3-24-07 and for the most part i am happy with it. I have had other tuners and 3 pcms tuned by a company in canada. As far as i can tell power gains are as good as the custom tunes i have had. The problem i am having is with the shifting. If i put the go pedal ...