So I decided to put that old Nakamichi Head unit I had sitting in the garage in the truck this weekend. It was an extremely easy install, but when I looked for some info online I noticed that a lot of people were asking how to do the install, but there was limited info for 1st gens, and even less pictures. So I quickly made a tutorial of how I installed the head unit, not the wiring part but the physical install (that is the easy part, I used Best kits and harnesses part no BHA 1761, and this diagram).
This is not the best how to and it might be a bit too long, and my pictures are crap but I hope this might help someone (disclaimer, this is not telling you how to do it, but how I did it).
Step 1: Disconnect your car battery.
Step 2: Admire your old deck and say goodbye.
Step 2: Remove the circulating air/vent knob and the fan speed knob by simply pulling out.
Step 4: Pull outwards on the temp/mode dials and they will come off.
Step 5: Pop off the face plate (I used a plastic scraper in the top right corner and it popped off really easy, but use what you will and be carefull not to break it). The A/C button will come out when you you pop off the face.
Step 6: Remove the ashtray by pulling it out all the way, then depressing the top piece where my thumb is downwards, then slide it the remainder of the way out.
Step 7: Remove the screw right behind where the ashtray was.