I don't know how hard it is to remove the gauge cluster in the 370. In most cars it is fairly simple, remove a couple of screws and pull out.
Anyways, if you can get to the bulb or LED, apply a dab of black high heat resistant paint on the top. This will dim the brightness and will not look "jury rigged". If it's an LED then you can use nail polish, I used this trick in my old 300ZX.
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