| I took the speedo out earlier today and noticed the corrosion on the PCB but it didn't look like any traces were affected. Then I saw a post from someone here who mapped out the ground and positive points so I decided to pull it again and check. Sure enough I had no continuity on a very small trace on the positive side - hit by time, heat, and corrosion. I took some small speaker wire and soldered a joint togother and voila! On a note to others my symptoms were:
1.) Speedometer failure - Odometer and all other instruments fine. Cruise Control operational.
2.) Hicas light intermittent - reset by ignition.
3.) Power steering low/high adjustment failure. Hope this helps others and a big kudos to DVDBURN (MD) for posting the pic (below)! [ http://www.twinturbo.net/nissan/300zx/forums/general/view/2419917/Incorrect.html ]
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