Vintage NOS Stewart Warner 10,000 RPM mechanical tach. Needs a cable to work. Been packed away for years. Has MADE IS U.S.A. on the outside of the box. Has metal bracket and metal light bulb socket, you don't get those anymore.  It is 3 5/8" across the front bezel and fits in a 3 3/8" hole and is about 3 3/4" to the end of the studs for the bracket. Black bezel and has the adjustable red line pointer. Brand new in the box. Made in Chicago IL. U.S.A.

Box reads:

Transoptic lll Lighting

3 3/8" diameter Face For Easy Readability

High Visibility Fire-Orange pointer

Electric Tachs Are Voltage And Temperature Compensated

Rugged Race-Proven Mechanism

Instantaneous pointer Response

Mechanical Tachs Feature Rugged Positive Drive Action

Standard 2:1 Ratio