vtg OEM tractor tachometer Proofmeter Ford 8N (1950–1952) NAA 600 800 series pto old original untested.
vintage tractor tachometer, commonly referred to as a Proofmeter, used on classic Ford tractors.
- Application: Designed to fit vintage Ford models like the 8N (1950–1952) or later 4-speed utility tractors (NAA, 600, 800 series).
Features: Multi-scale dial that measures engine RPM in hundreds, ground speed (MPH) across different transmission gears, PTO speed, and accumulated operating hours.
Part Numbers: Commonly matches OEM and replacement references such as
8N17360A1 or C3NN17360N. 081326