I did the same thing 2 weeks ago. My oil temp is a vdo from an 80s vintage vw scirocco and the voltmeter i had picked up at a pawn shop years ago. I used a piece of 3/16 luan that i put a couple coats of poly on and it matchs up fairly good. Also i put the cig lighter in the center(for cel charger) along with a glow indicator. I would post some pics but i have no clue how to do it.

I noticed that the power to the ash try light does not dim with the dash lights, so if you want your gauges to dim tap into the dimmer wire from the radio.

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82 Rabbit diesel (first d), 84 Jetta turbo d (300k when sold), 83 240d (305k when sold), 84 F250 6.9d w/Banks turbo(parts truck), 86 F250 6 cyl.gasser(waiting for 6.9d), 84 300d ( 347k Sold 8/04), Y2k New Bettle TDI (185k miles), 95 740IL (wifes), 87 300TD (206k Sold 7/05), 05 Passat TDI Wagon