1967 valiant cuda?!

1975ValiantDuster said

So your saying its possible just a little difficult

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Yes sir, and I'll also say the cost far outweighs the benefit. The factory rally panels have there very own collection of issues. I'm sure you have seen them offered here. Some with tachs and/or 150mph speedometers, for as little as 150 bucks. Only reason I don't point out what I can see wrong with those... that type comment is not allowed. You'll have to buy one and learn the hard way.
The gauge service companies are hoping you'll do just that.
There are smarter alternatives. A custom instrument panel in your dash will allow new, much more accurate instruments, more eye candy options, etc.., at a much lower total cost.
Please take a good look at the custom instrument panel threads here before making a decision.