We have used this one at work and have been pleased, but it could probably be reproduced for about $100 by a hobbyist.
Hickok 48165 Universal Digital Pressure Gauge with Remote Readout
Amazon.com: Hickok 48165 Universal Digital Pressure Gauge with Remote Readout: Automotive
It's also available as a waekon brand. May be cost prohibitive for someone that doesn't use them routinely.
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