Funny you should mention the backlights on the SPA. My boost/egt just lost one of the green LED's (the red works fine). I mentioned to SPA and they are sending me a new guage (only had blue backlight in stock and I didn't even know they existed). The dude on the phone said they have had issues with the LED's and have fired the company that was makeing them, he also said no failures on the newer units. I'll let you know.
If you go SPA, be patient, I have had to wait WAY too long for every guage I have ordered. The fact that I waited is testament to the fact that I really like them. SPA egt/Boost is perfect for the srt-10 pillar, very visible and doesn't clutter up your view of the road the way 2 and 3 guage pillars or PDA's etc. seem to.
The Dakota guages look kicka** also. I was already on the SPA bandwagon before I learned of them.