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You're in luck. Awhile back, I made a table of RPM vs speed vs gear, based on published gear ratios for various cars I owned or considered buying. So here you go:

A-413:
1st gear: 2.69:1
2nd gear: 1.55:1
3rd gear: 1.00:1
Reverse: 2.10:1
Axle: 3.05:1

1st gear at 2800 RPM is about 25 mph
shifting into 2nd at 25 mph, RPM drops to about 1700 RPM
2nd gear at 2800 RPM is about 42 mph
shifting into 3rd at 42 mph, RPM drops to about 1800 RPM
2800 RPM in 3rd gear should be about 65 mph

This will vary a little with tire size, I think this is based on 15" (849 tire revs per mile).

If you want to swap your tach board with my known good one, let me know. I have a partial schematic and can test it functionally, maybe find a bad component if there is one. Make sure the Chrysler P/N is 4375410, that's what I have.
 

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How is the tach behaving? Is it just dead, or does it flutter/fluctuate all over the scale, or read too high or low? Or work intermittently?
 
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