(Weld-On Kit). Computech’s Exhaust Gas Temperature Kit, and RPM Recorder. Determine proper jetting to achieve maximum performance without the worry of being too lean and causing engine damage. And without the expense of an on board computer system. RPM Recorder can give a replay of the entire run’s RPM range.

The #4100-2 has dual outputs to monitor two cylinders, and comes with 2 probes.