I installed gauges on our tanks. Don't really function as a gauge normally would. Gives 3 readings - have gas in the tank, almost empty and empty. Works okay for me. Can just flip the lid on the top of the tank cover to read the gauges, but is probably just as fast to lift the cover off. Had to install an elbow for each gauge to get the hose arrangement to work.
Our TT came with the regulator facing towards the rear and could not read the indicator to see if it has switched tanks. Why would they do that? Flipped it around but had to lower it on the threaded rod so the hose to under the trailer would reach.
You can manage just fine without gauges or a level indicator by monitoring the indicator on the regulator. You can now buy a see-through fiberglass 31 lb tank as in the photo for $300. There used to be another one a few years ago but was recalled and taken off the market.
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