I also have the Isspro tach but it doesn't have the redline markings. On my Oil & Boost gauge, my oil one is a white faced and it shows up so much better then the dark face ones. My boost gauge goes up to 65 lbs and I hate how I only use half of that gauge. Will probably look for a white faced 0 - 30 or 35 lbs gauge some day to replace this one. Boost is currently only getting to 26 lbs all the time and I feel that is the most I will get out of this truck until I pop in new injectors. But even then, I would assume it may give me only 5 - 10 more pounds of boost so with a 0 - 35 gauge, I should be safe. I do love seeing that boost come on strong though and hit 26 every time.