If you could get a really tiny Bluetooth pressure gauge that tells you your tyre pressure via ANT+ or something I could imagine a pro going for something like that in the TdF.
But no idea what the hell the pump bit achieves
If you've got Schraeder valves:-
https://www.ebay.co.uk/i/172963843074?chn=ps&adgroupid=43920634520&rlsatarget=pla-359427365517&abcId=1063846&adtype=pla&merchantid=118938773&poi=&googleloc=9045917&device=c&campaignid=797602469&crdt=0
Not ANT+ or BTLE though.
@Greenbank started
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If you could get a really tiny Bluetooth pressure gauge that tells you your tyre pressure via ANT+ or something I could imagine a pro going for something like that in the TdF.
But no idea what the hell the pump bit achieves