The Lanc's main instrument panel looks just as it did when produced over 70 years ago; mostly direct reading dials/gauges with vacuum driven gyros. The dual flying controls are also original, but retrofitted to PA. The V/UHF radio & intercom system is not original but now rather old and in need of updating. The Nav's TACAN is indeed discreetly hidden but never used.
A handheld GPS is invariably used, but then most of the Flt's Nav's are now on ground tours and so probably not as slick at clock/map/gnd as they once were!
The undercarriage does indeed include many Shack parts including the tyres (main wheel covers!) but the most modern part of PA is the tailwheel. Its tyre comes from an Airbus!