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I like the analog one better, its simple, damn near foolproof and if you get some yellow paint (I used nail polish) you can put a mark on it so you don't have to read the numbers, just see if the needle is 'in the yellow' or above.
The first pic shows what I did, the second shows how easy it is to read even if your like me and wear prescription glasses that make it hard to focus on close things quickly. With the stripe I don't need to see the actual number, the position of the needle is enough to tell me if things are OK or need to be looked at a bit more closely.
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