tach.ac rotate Needle /engines/engine[0]/rpm 0.0-128.6 0.1-123.85 500.0 -92.85 1000.0 -57.1 1500.0 -21.1 2000.0 15.4 2500.0 51.4 3000.0 87.4 3500.0 123.4 -1 0 0