Pontiac hood tach location appears to be close to the center bulge for the ram air tunnel.
for the engine color, light metallic blue is correct. i remember reading somewhere that said the instructions were wrong.
3) you can either touch up the chrome with silver paint, chrome foil (bare metal foil), repaint them (alcad) or send them off to chrometech usa to be rechromed (i assume that's expensive).
the box side shows custom (top) and stock (bottom). paint the hub area in flat black.
i suggest going to google.com and search 69 GTO judge and go to 'images'. it'll show a heap of photos of 69 gtos.