1980 911 SC speedometer test. With out oscilloscope.

1980 911 SC. voltmeter test. If you don’t have an oscilloscope. Yes this test is not 100% accurate for correct speed. This test will however let you know if the speed sensor at the transmission is sending a signal, wires are connected. NOT incorrect speed. This test would be best if your speedometer is not working at all. Hope this helps and yes it is a 911 sc NOT CS. Ultimate Performance Albuquerque, New Mexico.