What is the service history on the car? I did ALOT of research because I am thinking of buying one (for the past year). Did it have the wiring harness replaced?
I agree with the sending unit idea on the oil pressure.
Just replace the rotors when you do your front brakes next time.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R