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Discussion Starter #1
well while installing my new sunpro afr gauge that i got for my birthday ive come across a problem! i dont know which wire i have to tap into on the o2 sensor. the instructions say sensor signal wire but i have no clue which of the three it is?its an 89 turbo if that helps
 

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Im pretty sure that it is the blue one, the two blacks should be the positive and negative for heating purposes. I dont think that you are going to get an accurate reading with your o2 sensor. You will prolly just see the guage go from lean to rich when idleing then when hitting the gas it may just go to rich. try it out tho maybe im wrong
 
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