if you do this, 85 will be what you connect to the ecu. the problem is that it might be too much of draw, which could fry your ecu. i recommend you use a temp sensor to be safe.

 

You can run the trigger to a stand alone switch not even factoring the ecu in. Throw a led indicator up there and call it a day. don't input anything else into the ecu then is already needed. You will expereince little to no voltage drop.