well this looks bad and so does this!! ugh!!
#6
Those are the stock piece of crap hose clamps, but I have no idea what's wrong.
#10
Those are the stock hoses that have the quick disconnect. If they are good they work great but if you need a new heater hose, you are stuck going to GM and paying $200 for the both of them (they are only sold in a set and only complete). Look at Darling Reject's car to see what the cost effective replacment is. I dont know if her pics are still up on this site but she had to replace her hoses. As for the oil pressure switch, aside from your engine needs a serious cleaning I cant see a problem there either, at least not with the photo you took.
Massey
Massey