http://www.egauges.com/ ...try eGauges ... huge selection. I got a VDO for under $40; I really don't think that's too bad and the gauge looks and works great. I got the 15 PSI Vision Chrome. I bought a tubing/fitting kit at Napa for some piddly amount so the whole shebang came out to around $40.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)