On my Scarab III trim tab starboard is working but indicator appears to bottomed out. Cable appears fine not sure if there is a sending unit that's failed or a ground that's not connected. Anybody experience that problem?

The tab indicator is a kiekhaefer aeromarine btw

No sending unit. Cable all the way from tab to indicator. My guess would be to check the backside of the indicator for a disconnected cable or something.

Taking it apart this weekend.

Just be careful on the helm end...The indicator portion is on a spring and it'll shoot the little white nubby piece out.

That's of course if they're like mine, which are the black and white Keikhafer ones.

yep those are the ones.