standard RPM
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I have a 4k tach in all 3 of my trucks. They all have the stock gov spring and I can still hit 3500 rpm's. Don't get a 3, you will outgrow it. Your talking a full sweep 270 degrees or so for only a 4 k tach. Its plenty easy to read. Its not like its a 10k tach with the numbers close together.
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