Unfortunately the aftermarket follows what's popular. There are probably more 12 second Civics out there than Supras *total*. From a business perspective, it makes sense.
If I were to do a custom setup again, I think I'd fabricate a collar of sorts that could hold one gauge on each side of the steering column at the 10 and 2 positions. Seen that in a few Subarus, looks nice and in the field of vision, more or less.
While we're on the subject of gauges, has anyone ever seen a HUD setup on a Supra before? I had a 240sx with one that didn't work very well and it was in the C5 I drove. Seems like it would be in the way, but I rather liked it...