I currently have an electric fan temp sensor unit that sits in the radiator top hose, it works great, but i now want to go for a cleaner look. I have a later thermostat housing with several extra threaded holes, one of which I'm assuming is for the temp sensor shown in the pic. Is it a standard on/off sensor for fan control or am i barking up the wrong tree and it's a resistive type for connection to an ecu? And i will need a source for the wiring side plastic connector or a decent used example. Looking at the housing, i guess the small bolt in the top part could be for the sensor, or does it go next to the temp sender for the gauge on the bottom portion?