In a message dated 98-08-02 22:57:52 EDT, young@SHERLOCK.SIMS.BERKELEY.EDU
writes:

<< monitoring the voltage output
 of the sensor while adjusting the mixture.  You adjust until the output
 is about .5 volts; you never really see a steady .5 volts, but a rapid
 fluctuation above and below that point.  Counterclockwise leans and
 clockwise richens.

 On Sun, 2 Aug 1998, Dan Hall wrote: >>
When adjusting the mixture to around .5 volts (500 millivolts) be sure that
the O2 sensor connection wire is disconnected while doing this proceedure.
 Michael Modl
 87 syncro
 87 Quattro