This is believed to be a N.O.S. Sun Tach. 5000 RPM, 12 Volt. Still In Original . Box. With Installation Instructions, & Warranty Tag (LOL) Original Bulb & socket. No Surface Rust. The Correct SunTransmitter Sender Is Model # EB-12V 8 Cyl. I will throw in another Sending Unit for $25. Buyer Pays Shipping. E-Mail Me at, email@example.com for further info. if required. quired.