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Not confused. Your missing my point. It's a HUGE safety issue to not know what is going on with the engine in a easy to see manner. Looking at your phone is NOT the solution in the long term if you are actually going to do this. You need a real gauge, in your line of sight all the time. Blocking the radiator is DANGEROUS IMHO. You need proper precautions. There are even OBD2 electric gauges that are small can can be mounted on the dash. My buddy had one on this track car years ago.
Who doesn't have a windshield phone mount these days?
Don't let this thread die!
How is the fuel economy with the grille block?
There is a company that makes grille blocks that are electronically controlled, they use them on the newer Subarus. You could probably get one to fit the GX. Or make a set with some old miniblinds and a motor.