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I am planing to buy aem uego fro my d17 i have read some post here and got confused on how do you install the gauge. question is can u just replace your oxygen sensor in bank 1 or do you have to drill and weld bolt into your exhaust?

 
Rep Power: 238

If you have a factory wideband, in theory you could replace it, but I'm gonna say probably not. Typically you weld an o2 bung onto your exhaust. The gauge is just a standard 52mm gauge. Find a cup or pillar or mickey pod or whatever floats your boat and stick it in there.