Suzuki - Tachometer w/Troll Mode Scale - Black - 34200-93J43 This 4" Tachometer is easy to read and features a scale ranging from 0-7,000 RPMs for general purposes and 0-3,000 RPMs for Suzuki Troll Mode System with markers at 50 RPM intervals. Moreover, the device contains warning lamps for Engine Temperature, Low Oil, Check Engine and Over-Rev. When in Troll mode, the Over-Rev lamp will stay on so that you know it has been activated. The secondary RPM scale is designed to make the process of establishing and preserving a slower troll speed easy.