I figured I'd go thread-mining rather than start a new one regarding custom gauge installations...
The Imperial presents its own set of challenges, since despite appearances everything is different from the other J-cars in the dash panel, including cluster mounting points, etc. The usual J-car stuff just plain will not fit. I did in fact go with Speedhut gauges, and am very glad I did so. The quality is excellent, the senders are better than others' (mil-spec in some cases), and they offer a variety no one else has. They are somewhat expensive, but in the long run they're much
less expensive than AutoMeter's G-Series, Cobalt, Sport-Comp II and other series that use stepper motors and illuminated needles. The gauges have programmable warning lights in some cases; in others the button is to program for whatever sender you're using (speedometer, fuel).
My layout required more gauges than average, and though I like VDO gauges they do not offer a full range of gauges in any of their designs. They also don't offer 270° sweep electricals and I'm not crazy about mechanical temp gauges since the tube is a liability. Another benefit to the Speedhut gauges was their mounting depth. The deepest gauge I have protrudes barely an inch behind the stiffener plate for my custom cluster. For a small extra fee, I was able to send them a font file that is pretty close to what Chrysler used at the time. Unfortunately, I wasn't specific enough with my demands. They're not quite perfect, but overall I'm happy with them. They're closer to "factory" in appearance than anything else offered. AutoMeter gauges would've cost several hundred more than I paid for this setup. It fits inside the stock bezel where the horrible digital cluster once sat, leaving all of the other controls stock and untouched.
This is as far as I got... I did this during a break from replacing the roof on my Challenger just to get the layout set:
I use Speedhut gauges in all of my custom applications. Their product is great, and they have excellent customer service.
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