So I posted the question by mistake on the suburban thread and I got this back.
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Old Today, 07:48 PM
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HO455 HO455 is offline
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Join Date: Feb 2016
Location: Portland Oregon
Posts: 9,072
Re: What is this for?
I believe it is part of your optional Speed Minder speedometer. The knob is supposed to move the second needle on the speedometer.(Yours is pointing to 55 MPH)
Here is a link to one of many posts on them.
It's supposed to warn you if you exceed the set mph.
http://67-72chevytrucks.com/vboard/s...d.php?t=693557
For more information type Speed Minder in the search box above and click 67-72 button.
And welcome aboard.
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http://67-72chevytrucks.com/vboard/s...d.php?t=698377