E30 Zone

I no I have seen photos and write up on this being fitted to a m52 but despite a search I can't find the answer.
My m52b28 alloy block doesn't have another hole to screw the brown temp sensor into next to the original needed for the ecu .whats the alternatives? Do I need to drill and tap the flat section next to the original to take the brown sensor or is there another way? Thanks

Machine the sensor, cut a new thread into it of 12x1.5 and screw it into the throttle heater outlet which is the next hole along

what i have done i know its probably not reading 100% accurate but better than no temp gauge ive made an adapter and added it to one of my water pipes,