TomGeorge:
Hi,A potential divider will work, but you will have to cut into the wire.
Using shunt method is not recommend as the sensor is not designed for that sort of loading.
Here is the typical output characteristics of your map sensor.
It has an output impedance of <50R.
It can only Source 0.1mA
As you can see, if you use shunt scaling you will be sourcing 6mA.Tom..
Thank you very much. Now I have established that this is not achievable. I'll push thru with my DAC method