Bob,I also did the dash light upgrade to the 5 SMD from Superbright LEDs. They are a bit on the pricey side but are dimmable, not polarity sensitive, and come with a 3 year warranty. I recently had one of the bulbs that were "Trial" bulbs in the license plate lights on my Super Duty fail and they replaced it no questions asked. Below are the before and after on my Monte Carlo's. Yes I also did a gauge swap on the 79 Monte Carlo. I used the Cool White bulbs on both. Their drop down menu allows you to type in the make and model to find just what you may need.
Super Bright LED's is also running a 10% discount on their site at this time.
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79 Monte Carlo
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88 Monte Carlo SS
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Thank you for posting the dash gauge pics. Wow! What a noticeable difference. You guys have certainly convinced me.