What is the thing that is big round and has a small ford decal on it and how do you use it oh and what is that thing that says 80 70 60 50 40 30 20 10 5 -10 -20 -30 -40 -50 -60 -70 -80?

The big round with Ford decal, do not know. The gauge with -80 to +80 sounds like the oil pressure gauge. You need an owners manual real bad. I suggest you get one. Salvage yard, dealer, Ebay, and many on-line sites are sources. BTW, not my photo.