The facelift Jap spec cars came with those gauges, roughly about 96.5 - 97. So unfortunately only available on RHD cars.
I don't think any export cars ever received those updated gauges. The only time we see them here in the UK is on imported cars, which tends to be the majority of Supra's.
All reports indicate that the boost gauge is utter shite, and comparable to the one that came in the MKIII.