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Welcome: On the grill block, you can block the upper one entirely and you probably won't even notice any difference, temperature wise. On the lower part, in the bumper, you should be able to do fine with a 1 inch by 4 inch slot and the rest of it blocked. I am running that on my 89 Civic and from mid September through mid June I can't see any engine temperature increase, in town, highway or anything.
The other change you can make, if your willing, is to bump the tire pressure up to 55 lbs or so. A lot of people are not comfortable with that, in which case you can just use the maximum sidewall pressure. I've been running 55 on old balding tires and on brand new Michelins and I haven't encountered any issues with it, but the car does roll quite a lot further.
On the Scangqauge, you should be able to just get it and plug it into the port on your car. From what everyone says, that would probably give you the biggest improvement. My car is an 89, so it won't work, but mine is paid for and I can get about 37 on the freeway, at 80, so I am pretty happy with my cost effectiveness.
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