Did some testing again today,air temp was 50 degrees and our elevation is 3000ft.Under many full boosted runs on the highway I observed o2 voltage readings of around 0.889 to 0.899 volts, cruising at steady throttle around .50-.60 volts range;this explains why the "Dawes device" LED meter is reading in the red due the fact that the standard calibrated range runs from .75-.90 volts for the red zone.I also set the fluke multimeter to store the highest and lowest reading of the o2 and it was a low of 0.010 to a high of 0.932 volts,I've heard that the bosch o2 for my 89' turbo doesn't typicaly go past the 0.930 volt range.My question is; should I have the "Dawes device" recalibrated so the danger zone is .79-.83(red).83-.85(yellow).85-.87(green)considered safe and .87-limit of o2 as overly rich?Some have suggested to use a vortech secondary fuel pressure regulator to add more fuel pressure only under full boosted conditions to help or eliminate the potential for an overly lean condition,based on my o2 readings I wonder if adding more fuel under full boost will drive the o2 close to a 1.0 volt(full rich condition)?Thanks for all who have helped me up to this point, I know this car is 14 years old but the motor seems strong and I am running a 2 1/2 cat back single performance muffler and electric fan conversion which also comes on under boost pressures of over 1.5 psi,I want to enhance the car but not break it either my boost pressure is gating at 9 psi right know and my fuel cut off switch shuts things off at 11.5 psi,so my goal is around 10 psi total to keep things somewhat reliable.Thanks again,I will post more info as I do things to this car.