I need both gauges (speedometer and other gauge) which was $550, at least that's as inexpensive as I could find it. And yes, that's the "Classic" I was talking about also. Did I miss the cheaper ones? Your link doesn't work for me, perhaps because I'm accessing it from my mobile phone.
Do you need to replace both gauges? What company is "Classic"?
1950 replacement oil pressure gauge: $60 (0-30 or 0-60)
1950 temp gauge: $60
Full 1950 complete mounted gauge set is under $300
Classic Parts of America (Truck Parts)