The EGT and CHT wires from the #2 and #4 cylinders were all eventually bundled together at the bottom of the back left corner of the engine and then routed up the engine mount to the top of the engine and secured along the way with Adel clamps.
EGT and CHT wires for Cyl #2 & #4 bundled and secured - aft left bottom corner of engine
EGT and CHT wires for Cyl #2 & #4 bundled and secured - aft left top corner of engine