The guy that tunes my car told me it would be a good idea to have a EGT gauge. I'm really not crazy about covering my cockpit with gauges, i currently have four. One of the gauges i have is an A/F gauge. My question is, is the A/F gauge worth having. I have heard that they are not very accurate and is not quick to respond (the reading is delayed). If it is not worth having i would rather replace it with an EGT gauge. Any help here please.

Also, on a turbo application where would be the best place to install the probe?