Sorry that what I have to say is not going to answer your question but, I would recommend to just go ahead and get the gauges. The little cost now compared to what it can save in the long run is more than well worth it. It can also help you diagnose other problems later.
I am not promising anything but, as long as you keep it easy on the throttle you should be alright as long as you have upgraded you exhaust and intake also. Do you have an auto? That can make a big difference depending on driving style.
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