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Discussion Starter #1
just got a Autometer phantom MAF and have a question.
Which O2 sensor should be used to obtain the signal for the air/fuel gauge ?

The one closer to the exhaust manifold or the other one?
which wire is the signal ?

there are 2 white wires , a grey and a purple. on the conector
 

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Use the O2 sensor before the catalyst.

The stock VW sensor is heated and so has 4-wires. The diagram I have indicates that brown is ground. Not sure how to map the stock wires to your wires.
 

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Discussion Starter #4
thank you.
I decided to try the sensors cause i was impatient .
wired to the wrong one ( got lean reading )

I will wire to the right one now.

BTW

Ground= Brown
White: heater
White= heater
Purple= signal
 
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