New , inexpensive tachs are a fraction of digital ones according to my research.
Accuracy of digitalis just wasnt important to me and if the OP had them calibrated for even less...hard to argue with.... in my book compared to sending thousands on critical systems cutting into the non critical budget columns.
But I know for some money is much less of an issue and I wish I could do some upgrades, this just wasnt one of them.
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