Autometer Gauges are pretty good, they have been around for years unlike a lot of companies now making cheaper gauges like Supercheap "calibre" and autobarns "drift" brand.
You can get 52mm gauges in electronic senders for roughly $120 each (sometimes less on sale or 20% storewide on promotion @ Autobarn)
I have had water temp, oil temp, oil pressure and boost/vac all in metric temperatures for a few years now and never had any problems.
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