M.engineInfo vs simpleGears UI app

I don't get stuck too often, but rebuilding my custom gear app is giving me trouble this time.
Below an example of unmodified code ↓

vehicleController :

Code:

if streams.willSend("engineInfo") then
    M.engineInfo[1] = controlLogicModule.idleRPM or 0
    M.engineInfo[2] = controlLogicModule.maxRPM or 0
    M.engineInfo[5] = controlLogicModule.rpm
    M.engineInfo[6] = gearName
    M.engineInfo[7] = controlLogicModule.maxGearIndex or 0
    M.engineInfo[8] = controlLogicModule.minGearIndex or 0
    M.engineInfo[9] = controlLogicModule.flywheelTorque or 0
    M.engineInfo[10] = controlLogicModule.gearboxTorque or 0
    M.engineInfo[11] = obj:getGroundSpeed() -- airspeed
    M.engineInfo[12] = electrics.values.fuelVolume
    M.engineInfo[13] = electrics.values.fuelCapacity
    M.engineInfo[16] = 0
    M.engineInfo[17] = electrics.values.gearIndex
    M.engineInfo[18] = controlLogicModule.isEngineRunning or 1
    M.engineInfo[19] = electrics.values.engineLoad
    M.engineInfo[20] = wheels.wheelTorque
    M.engineInfo[21] = wheels.wheelPower
  end

simpleGears UI app:

Code:

if (streams.engineInfo != null) {
            scope.gearboxType = streams.engineInfo[13];
            if (scope.gearboxType == 'manual') {
              var mGear = streams.engineInfo[5]
                , maxFGears = streams.engineInfo[6]
                , maxRGears = streams.engineInfo[7]
                , sign = mGear ? (mGear < 0 ? -1 : 1) : 0;

engineInfo[13]
controller : fuelCapacity
app : gearboxType

engineInfo[5]
controller : rpm
app : mGear , which according to me corresponds to 'currentGearIndex' or 'gearIndex' ?

engineInfo[6]
controller : gearName
app : maxFGears

engineInfo[7]
controller : maxGearIndex , which according to me corresponds to 4,5 or 6 or 12 etc ?
app : maxRGears, which according to me corresponds to 1 or 2 (at least for 'vanilla cases' ?

Any feedback would surely be appreciated
--- Post updated ---
So far the only thing I can think of is that there is a possibility that the LUA table is read by the JScript in a raw manner and that LUA tables start reading their first index as '0' and JScript reads the first index as '1' so the indexes are stepped but this is a bit too crazy imo

 

Oh.. great ! At least I've got that out of the way then
Thank you, Diamondback !