Engine block or head temp?

[MudRunnerTD]

Does anybody know what size hole is required to be drilled for a 1/8NPT tap?
The 1/8NPT tap was luckily the only imperial tap in my kit but has no info on what size hole to drill.

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Hi mate, you should be able to size by eye. Look through the thread at the drill bit. You want to see the bit is bigger that the shaft but smaller than the thread.