There two tachometers were removed from factory new Extra 300's that were going through avionics rebuilds. Units are new.

Provides diagnostic and performance information about the aircraft engine and ignition system not normally available with current mechanical or electrical/electronic tachometers.

Horizon instrument's P-1000 eliminates problems resulting from inaccurate tachometers: engine operation outside of allowable RPM ranges, reduced engine life, reduced fuel economy, reduced power, or propeller overspeeding - all of which can result in hazardous flying conditions. 

The P-1000 is STC approved for primary installation, not just secondary. Also incorporated into the P-1000 is a highly accurate engine hours clock, and an RPM Trap memory that recalls the highest RPM achieved by the engine. Both features are enabled with a touch of a button. The P-1000 is housed in a rugged, light-weight aluminum standard 3-1/8 inch "MS" style case.

Installation is simple. Only four wires are connected, all of which are located under the panel! The P-1000 is the ideal aircraft tachometer, for upgrades or new designs, providing the conscientious pilot with high reliability, accurate RPM reading, and valuable diagnostic information.