What does it mean when it says pre-turbo and post turbo? Then there are some that dont even have that. I was looking at the ISSPRO white face blue lettering blue illumination, and LT. blue indicator. Will the egt gauge work it doesnt say pre or post turbo. Thanks.

 

It's the same gauge, but just where you mount the probe. In front of the turbo, or after the turbo. In front gives you a better idea of the exhuast temp coming right out of the head.