Vtg Stewart Warner tachometer 4500 rpm Odometer Hour meter Semi Truck Tractor Trailer   untested,  featuring a reverse-wound needle and a 4,500 RPM limit  likely 40's 50's  came with a bunch of vintage motorcycle parts.....believe its a 760 series

 This specific instrument is a mechanical recording tachometer designed to monitor engine revolutions (RPM x 1000) and includes an integrated odometer-style counter for "Engine Revs. x 1000".Key Specifications & IdentificationSeries: 760 Series (often identified as Model 760-E or similar variants).Measurement: Scales from 0 to 45 (representing 0 to 4,500 RPM).Era: Produced primarily during the 1950s.Applications: Used in a wide variety of vintage vehicles, including trucks (such as 1950s GM/GMC models), marine vessels, and military equipment.Voltage Variants: Stewart Warner manufactured these in 6-volt, 12-volt, and 24-volt configurations..Maintenance: Companies like AccuTach Co. offer modern transmitters to allow these vintage tachometers to interface with contemporary ignition systems

selling as pictured