The SeeLevel gauges work really well. We had them installed at DRV when our unit was being built so not sure how much of a problem it may be to install after the unit is built.
The original gauges on our unit that DRV normally installs are gunked up, especially the black tank, and do not function well. We only rely on the SeeLevel gauges and have not encountered any problems. We have learnt to trust the Seelevel gauge readings.
If you can get the SeaLevel gauges installed after the fact, I would suggest they are well worth the cost.
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