I find it funny that my 13 year old vehicle has more gauges and info than new cars. I'm guessing that it's running around 190 right now. it's normal operating temp is probably 180. 260-280 is usually overheating. To measure load on the engine, I just use my volt meter. when the volts drop, theres more load on the engine. when the load is off, it creeps back up to 14+ volts. when I turn the a/c on it drops to about 13 volts, then when the compressor kicks off, it goes to 14 again.
You could probably still block off the middle lower one. won't help with aero much though, just heating the engine faster and causing air temps to be warmer, reducing pumping losses. it will help. if that's too much, block off the sides, and leave the middle open.
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