This is a New Tachometer for IH Tractors.
Part #: 67679C2
It has the knob on the center to adjust the gear you are traveling in.
It has 2 light terminals in the back.
This will replace the original with the only difference being the light terminals.
This has a post with a hole in it and a set screw.
The light bulb fits into a socket that is pushed into the back of the gauge.
It makes a better sold connection than the originals.
Fits IH Tractor models:
766 - Diesel
786 - Early
886 - Early
966 - w/ Gear Drive
1066 - w/ Gear Drive
1466 - w/ Gear Drive
1486 - Early