now I know this may or may not help you but.
I have a honda element and I just did a EPS swap I used a EPS rack from a 02-04 civic si.
when it came down to it the system is very simple. all together the whole setup consisted of 15 wires. a rack. a motor mounted to the rack and a small ecu
but in the end most was for diag or dash lights.
it consisted of 60A fused 4 gauge power,4 gauge ground. and wires getting signals from IGN(keyed power),VSS(vehicle speed),ESS(rpm)
not that it would help a large vehicle(though it may) the system is very compact and getting standalone sensors would not be hard
