tachometer

I had seen someone post their dash on Facebook and I noticed that on his he had a line between the 6000 and 6500 mark. Is this like a break in period thing? Was it something coded in? The curiosity is killing me and I have yet to see it literally no where else. Not even car review videos on youtube.

I searched this up a couple times but didn’t seem to find anyone with the exact same issue. Let’s get a couple details out the way first. I am running a catless AMS downpipe with a BM3 OTS stage 2 e30 tune. Today I went on a short ride to grab some food and on the way back home I’m cruising...