I've looked around for gauge solutions for the narrow sweeper speedo used in the late 60's early 70's Darts and never found anything that would fit without a major dash reconstruction.
Then I stumbled upon the Itellitronix gauges and found their universal 6 gauge set and thought to myself "I can make that work", so I bought a set and went to work and here is the result of what I able to do.
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I did the same thing...fabbed them into the factory clear plexi.