289 Cobras above CSX2201 used a Stewart Warner two-piece tach. Besides the tach head in the dash there was a sending unit mounted on the firewall. Many over the years have failed. Usually it is the sending unit that fails not the tach head. Until recently the only option was finding a one piece tach unit that was similar to the original tach. Some were close BUT the tach face is different, the chrome bezel does not match the speedometer bezel and the needle may differ.
If you have an original non-working tach and sending unit, Mark Olson at Accutach Co. in San Jose can help www.accutach.com molson@accutach.com Mark can determine if your tach is good and if the sender can be repaired. In the event the sender can not be repaired, he can use a TachMatch that replaces the sender and calibrates your tach.
If you only have the original tach BrianLaine@aol.com in Arlington, WA can verify if your tach is working and provide a TachMatch that replaces the missing sender.
You can contact me if you wish additional information.
Pictured below are the tach & sender, the TachMatch and the internals of the TachMatch mounted inside the original sender.
Thank you. I was in need of this info!
Were all the SW gauges originally 6 amps?