Techincall questions.. im a supra NOOb

[Boostesi]

I just bought a supra 2 days ago
its an 89 targa top 7mge
Auto
a few questions... my overdrive light flashes on and off could that be verry bad?...

my speedo doesnt work, my odometer doesnt work.

therses a wierd grinding sound that sounds like a dry bearing in the reare end.. has anyone heard this?

and is there aplace you can get new seals for the targa top and about how much?

there was something else to... ohhyeh, my oil pressure sits pretty low at idle.. like that first bar over 0psi when i drive or rev my motor it goes up fine. what do you thinks causing that?

ALl helps appreciated