This looks like it's not entirely down to the engineers.
It very rarely is.
But then again its often been said that fuel gauges on most SEP's are a pretty much only fitted to comply with legal requirements to have them. But in actually fact they are pretty bloody useless.
The whole fuel system on the PA28 to me was always pretty ill thought out.
Fuel change over handle pain in the arse.
Gauges well out of your instrument scan.
Tommy on the other hand so much better.