Bosch LSU 4.9 spec sheet:
https://www.bosch-motorsport.com/content/downloads/Raceparts/Resources/pdf/Data%20Sheet_69034379_Lambda_Sensor_LSU_4.9.pdf
You can test the sensor to see if it's performing within spec. I highly doubt you bought an authentic Bosch LSU 4.9 with the gauge etc... for $90.
Before going too deep- check the sensor to make sure it's not bad. I've had multiple sensors arrive DOA.
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-Julian
1977 911 S: Backdate, EFI/ITB, AC project in the works:
http://forums.pelicanparts.com/porsche-911-technical-forum/1106768-when-well-enough-cant-left-alone-backdate-efi-itb-ac-more.html
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