I think it's a Euro or maybe Aussie speedo.
I've seen that Japanese site. IIRC The Japanese owner put in an aftermarket ECU without the 180km/h (110mph) speed limiter. Then he had to replace the JDM 180km/h speedo with the Euro 260km/h one so the needle didn't run off the end.
The UK speedo has an mph and km/h scale on it, because we are semi-metric here.
(In America you buy a pint of milk, in Europe you buy a litre, in UK you buy a pint but it's labelled 0.568 litres
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II