WABCO OptiTire System Description page 45

Installation
Mounting the ECU
Assembly on the longitudinal beam
Bus
– Use threaded rods for hanging assembly at the roof frame in the cabin.
– For solo bus: Position the ECU at the centre of the vehicle.
– For articulated bus: Position the ECU in front of the articulation in driving
direction.
Further possible installation positions are:
in the roof cove opposite the entrances (if the cover is made of plastic)
„
in the roof lining
„
with articulated buses, in the rear area of the front section (in the geometric
„
centre of all axles)
with coaches, also on the luggage compartment (if the luggage compartment
„
components are at least in part of wood or plastic)
– Read the chaptersee chapter 5.2 "ECU – The electronic control unit", page
31.
– Mount ECU so that the distance to the sensors is as equal as can be.
Select distance to truck driver's cab such that length of ECU cable (8 m) is
sufficient to reach driver's cab.
In the towing vehicle there is an ideal installation position between the front
and rear axles underneath the frame.
Maintaining good radio contact the ECU should not be shielded off by metal
walls in its direct vicinity, e.g. by a U-section.
45