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Does anyone know when Sun changed the dial on their tachs from no colored line on the scale...



...to a green line on the scale...



...to a blue line on the scale?



Trying to nail down time periods. I'm sure the all black/white unit was used up to the early 60's then they added the green line on the scale. I have three Sun RC 85 tachs with the green scale that probably all need repair/rebuild and I'm sure they'd be era appropriate for 1967 but would the blue line scale tachs be era correct for 1967?
 

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Are those things worth anything?

I have a box full of old Sun gauges. Couple of the green, and blue tachs, voltmeter, and some other wierd ones.
 
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