How do I install my new stereo into such an old vehicle?

Update: I have an old 1982 Dodge Ram Xplorer camper van that I'm trying to install my new DIN Headunit into. But I can't find any diagrams or information about the wiring out there. My new stereo is a Kenwood KDC-BT420U. I'm not sure what the old one is but I'll attach a picture of it and the wiring. I... show more I have an old 1982 Dodge Ram Xplorer camper van that I'm trying to install my new DIN Headunit into. But I can't find any diagrams or information about the wiring out there.
My new stereo is a Kenwood KDC-BT420U. I'm not sure what the old one is but I'll attach a picture of it and the wiring.
I know I could just take it in to have it done by pros but the previous owner glued the headunit to the dash veneer so I'm not sure if they'll deal with that.
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