Careful and attentive pressure monitoring is key to satisfactory performance
of the Tubliss system. Larger-than-usual pressure losses are an early warning
of trouble, but not particularly disruptive if one catches the symptoms before
they upset the seal of the beadlock on the tire.

It's best to measure and record pressures in both beadlock bladder and tire
at regular intervals. Daily, after initial installation, weekly and then
at longer intervals as one learns how fast things change. It's unrealistic
to expect month-long check intervals unless one is both careful and lucky.

Tire pressure measurements are fairly straightforward, but bladder measurements, especially the 21 inch front, are tricky because of the high pressure and
very small volume. A gauge which loses no air on connection still needs some
air to pressurize the gauge, with the small volume of the bladder the error
introduced is significant, If the gauge leaks audibly on connection, it'll
be very difficult to obtain any but the crudest notion of pressure.

An air chuck that seals to the stem before opening the Schraeder valve is
more-or-less essential. Screw-on chucks can sometimes be made to seal before
opening the valve with a thicker gasket or a shim under the original gasket.
Lever-type chucks will work better on clean stems, with good lubrication
of grommet and lever for quick, easy action.

To estimate the error introduced by the gauge, take a series of reading
in rapid succession, being careful to minimize leakage and to keep the
leakage the same in all tests. Do maybe eleven tests, and average the
change over the last ten, to get an idea what the loss is per measurement.

The best I can do in front is about 2 psi per measurement using a 
seal-before-open screw-on chuck with about a foot of hose to the 
pump/gauge. That should be compared with an average loss of one-half
to one psi per day as a normal front bladder loss, so errors introduced
by the measurement are significant for periods of less than a week on a
system that's working well. 

In that scenario, if the pressure was set at 100 psi and a week later 
measures 90, add the 2 psi gauge loss to estimate an actual pressure of 
92, for a loss of 8 psi in seven days.