So I bought a kit with three meters in one for under the dash. The temp gauge is now working well, and I'm moving on to the oil-pressure gauge now.

I'm wondering though about how effect this thing can be? The kit includes this little plastic tube to connect from the sensor to the interior gauge unit and the instructs say nothing about bleeding the unit to fill the little tube up with oil. Do you just have air in it? This seems like it would give a pretty inacurate reading, as a gas (air) left in that tube would be comressible. Perhaps somebody could explain how this is a normal set up and is an accurate way to get a pressure reading?

Thanks.