Here's the part that is needed to run the DNN990HD. This is the pic that Dan Martinez from Isis sent me just 2 weeks ago when I spoke to him. I don't have a part number, but he'll know what you're talking about. LOL! Again, per Dan, the cost is approximately $400 and its a must for the radio to work with the Isis System.
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'68 C10 swb
'69 Camaro convertible
'72 Chevelle
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