540,
Thanks for the question. I was involved with coordinating the instruments for the build on ProPane. The larger instruments that are used in that dash panel are the 3 3/8" size. The 3 3/8" fuel level gauge is a custom piece that we do not make. Redline Gauge Works utilized various components that we manufacture to create a one off piece for that vehicle. The smaller instruments are 2 1/16" size. I am not familiar with the specifics of what modifications were made to the panel to accommodate the instruments. In trying to use the stock dash panel the catch is going to be the third 3 3/8" sized hole. The only combination that I can think of would be to utilize the Designer Black Series Instruments and choose the 3 3/8" Tach #1490, Electric Speedo #1480, and Quad gauge #1412. That leaves you with 3 additional small gauge holes. However, there aren't too many additional options in that series that aren't covered with that set, maybe Boost #1471 and clock #1484? Otherwise, I would probably recommend some supplemental gauges from the Sport-Comp line as being the closest match.
Also, I believe that Covan's Classic has a nice panel replacement designed to house our instruments for that vehicle. That might give you some more flexibility in terms of instrument design choice without all the dash panel customization work.
If black faced instruments aren't your preference, let me know and I can make alternate suggestions.
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