Sorry I can't give you any info toward the S. P. A. gauges other than what the ones that have them already said. I do like there look and function though, similar to the X-Monitor IMO. I have the BD X-Monitor mounted on the A-pillar, and I like it other than in direct sun-light that is the only problem I have with it at times if I'm wearing real dark sun-glasses, but looking over the sun-glasses I see the read out just fine. As far as being readable at that position mine is mounted where I have no problem reading the three features(trans,pyro,boost) all at once, maybe it's the compact size. Also the alarm and record features are a plus to me. It's all personal prefence to most, some like digital and some like the antalog gauges,I like both myself.
Tony