Mercedes® OEM Speedometer Cable,Automatic, 1977-1981, 123-542-43-07 (123)

In the days before electronic and digital speedometers, mechanical speedos were cable driven off the transmission. If your mechanical speedometer quit working, binds up occasionally, or makes a howling noise, the speedo cable may be the culprit. The only other major problem would be the nylon gears within the speedometer itself.