mechanical temp gauge location

Hellloooooo FABO!!

I have read a couple of posts on mech temp gauge probe location and have seen that the recommended spot is near the thermostat. My EFI unit temp probe is taking up that fine real estate at this point and I couldda swore I saw something about being able to run it off the drain plug in the block. Now this wouldnt show me immediate fluctuation when the thermostat opens n such.......so if I am not supposed to use the block drain is a thermostat housing spacer my only route???

Speak to me oh wise ones.....