Electronics International R1 Electronic RPM Tachometer Primary 2-1/4 TSO

The Electronics International R-1 is an electronic RPM tachometer for primary-replacement installations. It combines a graphic analogue RPM display with a four-digit digital readout, providing both rapid visual reference and precise RPM indication in a compact 57 mm (2-1/4 in) flush-mount instrument format.

The R-1 is fully backlit and dimmable for panel use. Its integrated tach-time recorder records engine operating time above 1,300 RPM, while the automatic flight timer records flight time based on the configured RPM threshold logic.

• Manufacturer part number: R-1
• Primary-replacement tachometer instrument
• Graphic analogue RPM display and four-digit digital indication
• Fully backlit, dimmable display
• Integrated tach-time recorder and automatic flight timer
• 57 mm (2-1/4 in) flush-mount format
• FAA TSO'd and STC'd as a primary replacement

R-1 range markings and configuration must be specified for the intended installation and verified against the applicable aircraft and engine approved data. Installation should be performed in accordance with the manufacturer’s operating and installation instructions and the applicable approval documentation.

Relevant documentation, including the R-1 Operating & Installation Instructions, STC/Approved Model List and configuration worksheet, is available from Electronics International.