What is the difference with 1970 standard gauges?

[71Challenger/6]

What would have determined whether a 1970 standard dash used the outlined hash marks (top row in the picture) or the non-outlined ones (2nd row)? My brothers 1970 Challenger has the outlined ones, but the cluster I picked up has the non-outlined 1970 gauges. Cuda/Barracuda/Challenger difference? Early/Late?

My 1971 Challenger uses the set in the 3rd row.

Credit to Performancecargraphics.com for the picture I borrowed.

 

[challenger6pak]

The car build date. What date the change was I don't know.

 

[DetMatt1]

The better question would be why make such a change? Or were there 2 different manufacturers making these from different specs?
Here’s the one I have and it’s date code.

 

[71Challenger/6]

I'll post the date code tonight when I get home...

 

[challenger6pak]

Probably 2 venders. Seems a lot was changed in 70. Might be interesting to know what was happening in Chrysler during that year.

 

[71Challenger/6]

 

[tonysrt]

To add fuel to the fire my 71 Cuda also has the 3rd row gauge markings.

 

[DetMatt1]

As it should.

 

[Jimmyspeed59]

My 1970 challenger has a October 1969 shipped date on the paperwork and has the outlined gauges but I scrapped them for some modern gauges in my old housing.