Removing the panel is a big job so by using the hole made by the EFIS I have access to the rear of the panel. On the assumption that anything can break I wanted the ability to be able to remove any instrument with access from the EFIS hole.
With regards to the pitot static system I have fitted quick disconnects from Cole Palmer - not cheap but they work great with insignificant leakage - as follows (see top view photo):
Yellow - NPTmale into ASI/altimeter and female barb into tubing Red - barbed male/female into tube for Transponder Blue - barbed male/female into tube for EFIS Pitot/Static
In the side view photo you will see a double ended yellow arrow - this is where the tubing joining the ASI/Altimeter is supportrd from the underside of the coaming.
See this entry for leak testing/calibration of ASI
Regarding the static system I installed exactly as per Vans instructions except I stood the tubing off the fuselage bulkhead use cable tie/tubing (see inset). Note ducting/aft cable is now supported by P-Clamps on longeron not tie wrap bases (OK on floor with RTV but not on vertical sides)
