Stewart-Warner Mechanical Aircraft Tachometer C668027990121 • RPM x100 with Hour Meter – Tested Good

Genuine Stewart-Warner mechanical tachometer with integrated hour meter. This classic cable-driven unit was removed from a working aircraft during an engine/avionics upgrade and operationally tested good prior to removal.

Key Specifications

• Manufacturer: Stewart-Warner
• Part Number: C668027990121
• Serial Number: 551A9K93
• Type: Mechanical Cable-Driven Tachometer
• Scale: RPM x 100 (0–35) with built-in hour meter
• Includes: Gauge + mechanical sender unit (cable drive)
• Service Tag: Dated 7/15/2025 – “OPS Tested Good”

Condition & Certification

• Removed in excellent used condition
• Clean face, needle moves freely, no fogging or damage
• Hour meter functional
• OPS Tested Good prior to removal
• Guaranteed Functional – 30-Day Seller Warranty
• Seller pays return shipping if needed

Compatibility

• Cessna: 150, 152, 172, 182, 206, 210 series
• Piper: PA-28 Cherokee/Warrior/Archer, PA-32 Cherokee Six, PA-24 Comanche
• Beechcraft: Bonanza 33/35/36, Debonair, Baron (select models)
• Mooney: M20 series
• Experimental / Homebuilt aircraft (Vans RV, Lancair, Glasair, etc.)
• Most Continental and Lycoming powered piston singles with mechanical tach drives
• Buyer should verify exact fitment and cable compatibility with their aircraft

What’s Included

• Stewart-Warner Tachometer Gauge (as pictured)
• Mechanical sender unit
• Original yellow service tag

Important Notes This is a used, serviceable avionics component. Installation must be performed by a qualified maintenance technician in accordance with applicable regulations. Sold with the 30-day functional warranty.