Water inlet for temp gauge

[RTC1930]

I know the water outlet neck is the best place for the temp gauge but does any one run one of these threaded water inlets to hook up the temp gauge? I feel routing the tube from this would look a lot cleaner then routing it from the front. I just need to account for the delta between upper and lower temps while reading the gauge. Does anyone else do this? Am I missing something?

Thanks,
Bob NJ