> >> RTC ..... typically outside the scope of a speedometer/trip meter
> >
> > Mine has several clock functions. Trip time, way points, countdowns etc
> 
> But you don't need a RTC for that, just an accurate crystal.

Well, yes, but (not really wishing to split hairs) there is a distinction
to be made between what an RTC is and what does it. For example
an external device could be more efficient if keeping the PIC awake
used more power. And typically bare crystals do drift. Many RTC
ICs have TCXO, at a price sometimes

Personally I'd probably use an external 1s interrupt generator and
let the PIC do its own register updating. If this generator was from
a real clock, you also get to use the coil as the sensor

As an aside, the Scenix equivalent of the PIC's T0CKI pin is RTCC

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