Btw this is a trick from the DSM world... often people like to frown on the DSM tuning stuff as being primitive... yes the hardware might be but some of the things done with it by hacking the code is very impressive!
things like closed loop wideband use and Speed Density are old news in the DSM land :-)

Anyway if i didn't say it, thanks for confirming the rear inputs as being 0-5V my man! Good deal.

I tested this today using my LC-1.
It was already wired up to the Brown input, I just changed my analog output settings to match that of the Zeitronix and voila, works perfectly.

Yea, I haven't found a setup that doesn't have this feature.

Another car showing Wideband logging - Zeitronix in this case as well as the 4 bar map 
Car is rich as this is first tune for his new meth system, needs dialed in yet.

Calculating the factor and offset is easy.

To calculate the factor, we first must remove the offset. We do this by subtracting the value at 0v from the value at 5v.

19-9=10

This number is the value at 5v without the offset applied. To get the value per voltage we just divide this by 5 (volts).

10/5=2

Our factor is 2 and the offset (value at 0v) is 9.

Now we just apply the factor for the particular RAM variable that we are working with in ME7.

uushk_w voltage factor is 0.004883, so we multiply this by the voltage to AFR factor that we calculated for our new input.

0.004883*2=0.009766

ME7Logger applies a negative offset, so in order to use a positive offset we just need to flip the sign.

The values that we have been working with are AFR, therefore to convert our input to AFR:

Factor : 0.009766
Offset : -9

You can use the same method for Lambda, but keep in mind, if you are working backwards from AFR to Lambda, that the different manufacturers may use different factors from lambda to calculate AFR.

No, just the linear output from external wideband controller to the selected rear O2 signal wire.

You still need an external controller for the wideband.

yea we have the two spare heater wires that we can use for anything...

maybe 1 for switched power, the other for nb simulation (not sure you'd want it for anything though)