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Most likely you have 20 degree bulbs. Mathmatically, if you have 3 bulbs, you will cover 60% of the area, devided by 3 sections. Since it is hard to find an LED that will light more surface area at 3.8", so you'll have to modify the optics you have.
With a diamond blade on a Dremel (or carbon blade), grind off 1.5mm from the top of the bulb. This will give you about 45 degrees of light angle, therefore more than covering the needed 90 degreee area lit by the 3 bulbs. With the 2 other arrays, it will fill in nice.
Do not polish the lens, leave it flat.
Also, get some mylar strips to place on the inner backing of the gauge cluster (to reflect the rearward light). This will help cast an even glow onto the gauge faces, along with refocusing the LED's by grinding.
Try it out.
The other option is to make a focused beam cluster, like I did.
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