Check engine light??

VA PROTEGE

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2003.5 Mazdaspeed Protege
My check engine light came on a day after I got my guages put in. I have a Autometer boost/vacum, oil preasure, and air fuel. I have a catless apex downpipe with a O2 sensor for it so that my check engine light doesnt come on. The air fuel guage hooks up to the O2 sensor and I was wondering what you guys think... Do you think that the guage isnt hooked up right? Thanks
 
If there's a vacuum leak for a prolonged period I think it might throw a CEL. I'd get the code red at a place like Autozone...so you can find out exactly why it threw the CEL and go from there.
 
Dude, I went a bought a code reader and it paid for itself the first time I used it. The EGR valve pressure sensor on my truck went out and w/o the reader it would have cost me like $300 to fix. Did it myself for $50. The OBDII reader I got was from autozone and was $150.
 
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