To replace the factory FF gage with a remote one would probably cost a couple grand. First you have to find one STC'd for this particular model 210. If successful you pay the STC holder a bunch of money for his gizmo. Otherwise you're up for a one time STC for the unit of your choice. 337, FAA consult, maybe a DER, test flights, ICA, etc. It's not a homebuilt. As for fuel lines behind the panel, probably 90% of piston twins have them and probably 60% of piston singles have them and they only ocasionally light off. The 210 FF gage is just a calibrated pressure gage tapped from the flow divider and marked for fuel flow, no transducer, which BTW might require another 337. You could just extend the existing lines with unions and more hard line. Easy, fast, cheap. Minor alteration in my book. 210's are possibly the worst panels for being totally stuffed from behind.
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