Jonny, I purchased a classic parts the white Euro speedometer and gauges set for $450.00.
1948 - 53 Chevy/GMC - Speedometer: 100 MPH reading with all new rebuilt components. Gauge Cluster: 60 lb. oil, 12 volt fuel extended capillary tube for V8 or modern 6 cylinder engines. There is an additional core charge of $125. ** Original cores need to be sent in for rebuild. They need the temperature probe from original core you send in. The gauges worked fine the first time I fired up the engine. To me it was better to purchase a rebuilt set, that's done professionally. Very happy, it took about three weeks to receive them.
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Steve
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