"Richard J Kinch" wrote in message
. ..
Duane Bozarth writes:

Gages are pretty unreliable, especially when under pressure all the
time.

???? A device designed specifically for the purpose is unreliable???

Absolutely. This is the nature of the Bourdon tube mechanism.

Can you quantify "unreliable'? Will they stick in one spot,? Not go up?
Not come down? Read high? Read low? All of the above?