One New Aftermarket Replacement 5 Speed Chrome Tachometer Gauge that fits Ford Tractor models: 500, 600, 700, 800, 900, 2000, and 4000 (1955 to 1964).*** Gauge will fit a 3-3/8" Hole, Face is 3-3/4" Diameter. 1955 to 1964 ***-- Replaces Part Number: C3NN17360K