I need to replace those. could someone please give some comments, suggestions on whether or not it's easy to do, how much is the labor cost for each in general, and should I go with OEM or aftermarket, how much each part will cost me? many thanks.

 

oil switch- fairly ez to do. need a big wrench to take off. get some teflon paste on the threads upon reinstall.

tranny line - fairly cheap and ez also. just hard to reach. get extra hose just to make sure. new clamps would help.

P/S return hose - i think the hardest of the 3. just got a lot of routing of hose..and i assume it's not a hard line.

all 3 you can go aftermkt. the oil switch is fairly cheap. your choice.

 

do you have instructions on how to do it by any chance? I've got Chilton manual but it does not seem to say anything. Again, thank you.

 

errr..it's very straight forward. pull hose off..insert hose and clamp.
the oil switch you unscrew like a regular bolt or screw. unplug the wire 1st. go look at the hoses and etc and you'll get the idea. if it's something you don't think you can handle then go to a pro.