I'm may try this route and mount it to the top of the cluster housing, inside, behind the clear. The lights will point at all the guages and you shouldn't be able to see where it's coming from.

I use these and others at my beach cabin. (It's off-grid).

There are lots of goodies for your car at this site http://www.superbrightleds.com/led_prods.htm

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1981 300TD "The Green Lantern"
1980 300TD
1983 300D Euro "China Cat"