Which is more important AFR or Boost gauge?

solidus

I have to say that recently both were pretty handy. I wasn't making boost. On my 18psi map it was only hitting 15psi consistently and my afr's were off. After the whole Ebay Boost Leak check and Home made smoke test I got concerned because it did'nt find anything but was still behaving the same. Took it to a shop because I ran out of skill and lo and behold it was an exhaust leak at the header flange. Important part was I was able to observe the boost and afr behaving badly in real time as well as datalog. So I say both. Better to have and not need than to need and not have.
I have boost, oil temp, oil pressure, afr but while I was doing my diagnostics I was kinda wishing for an in car fuel pressure.

Quicksilvers

Yes both gauges are important indeed I’ve seen people not seeing the intended boost they originally tuned for and a quality boost gauge that is accurate will display this and creep can happen. Depending on how your tuner is the AFR gauge will show the quality of the dyno tune and show you if the AFR is off and a possible retune could be needed. As far as catastrophic failure go’s the oil pressure gauge is the only thing really that will save your engine because once you see 0 psi. oil pressure it is usually too late.

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Mr. Clean