Headlight woes, and more

Well, one of my problems is that I cannot get the right headlight to flip down. If I turn the lights off only the left headlight goes down, and I have to manually lower the right one. When both are down and I turn on the lights both headlights flip up, but the right will not go down.

I also wanted to know which car seat covers work best on supras. Any specific brand?

What oil weight I should use? (about 70K miles) Which brand is best? I also keep reading that adding an extra quart helps the engine.

What octane should i use? (7m-gte)

What exactly does tems do?

What can i use to repair a cracked dash?

What should the vacuum read at idle? At what rpm does the stock turbo spool?(what psi) When does it drop off?(rpm, psi)

What should the oil pressure read at idle? At 3k rpm? At 5k?

Can an aftermarket exhaust cause the check engine light to come on?

Is it normal for my foglights turn off when I turn on my headlights?

Sorry for all the questions, I'm new to supra and just recently became the proud owner of a mk3