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Chris recently reconditioned my 37 Packard Speedometer and now works and looks like new!

Mechanical Speedometer Repair, owner Chris Connors. 563.210.1695
Over 35 years' experience in repair of speedometer clusters and gauges (including Borden gauges) and automotive electrical accessories such as small motors, wipers, and switches. Cosmetic restoration performed on a case-by-case basis. Phone estimates provided when possible. Honest, knowledgeable, friendly service. Call with any questions.

I'm sure he means "bourdon" tube type gauges, nor Borden. These are the classic mechanical gauges for measuring pressure like automotive engine oil pressure and use a semicircular or coiled tube. As an increase in pressure tries to straighten the tube, that motion is converted into rotational motion to move the gauge needle, very simple and clever!

blog.wika.com/knowhow/bourdon-tube-pressure-gauge-functional-principle/