The one with the blue tape on the wire is for the climate control.

Resistance values as of 09/87:

5.0 - 8.0 k ohm @ 20 degree C
900 - 1800 ohm @ 60 degree C
460 - 650 ohm @ 85 degree C
300 - 400 ohm @ 100 degree C

You should be able to pull codes from pin 7 of the diagnostic connector near the battery.