i made a triple gauge din cluster for my R33 with Autogauge Oil Press, Oil Temp, Water Temp.
the only problem i had is that they are actally quite hard to read in day light. they look great at night, but on a normal summers day, i found myself having to lean in toward them and cup my hand around them in order to read them. the water temp was the worst and i ended up replacing it with a cheap white faced no-name brand one that read 10 degrees high.
i'm about to buy another 52mm autogauge oil press for my HR31.
hope this helps.
BTW, i'll have a spare 52mm AutoMeter AFR guage shortly if ur interested (excuse the gratuitious advert!)