Now as for the installation, I have the unit ordered and will wait until I have parts in hand to fully inspect things- but my idea right now is to drill and tap the temp sensor into the same Thermostat manifold housing that my current other coolant temps sensors are mount into on my M111 4 cylinder motor. I have over to the left a plug nut thatwill remove and drill & tap 12mmx1.5 threads to insert the metric temp sensor supplied with the kit I purchased.
HOWEVER, the temp sensor looks very much identical to the OEM ones we use. I may be able to simply splice into the existing OEM wires and use the temp signal already going into the cars computer off that same manifold block.
Battery power (Live 12 volt source) will come from the power block on the left inside fender just in front of the motor bay fuse panel.
Switched battery source (so the fans go off when the key goes off) will come from a switched (active when ignition key is turned on) fuse circuit inside that same described fuse box in the engine bay.
Here is a picture of a thermostat housing manifold part # 111 202 04 73 that I took off the internet and is pretty much identical to the one on my car. On mine the green arrow points to a hole where I currently have a bolt in position as a plug. I will remove that bolt and simply drill and tap this port into 12mmx1.5 threads for the temp sensor install.