lol, its called a tachometer, and all cars are difrent, yes go past teh redline, but ont hit the rev limiter take my s13 all gears are diffrent, 2nd i shift at 8grand, 3rd is 7,500, 4th is about 7,800 and soo its a thing u have to test out for a little bit, and yes all gears have better tq at certin RPMs so u just need to experament