Thread pitch and diameter of water temp sending unit

[David Kincaid <dave.kincaid@xxxxxxxxxxx>]

The hole for the water temp unit in the aluminum water pump housing I bought for my '62 413 is much too small, so I'm going to have to drill and tap a larger one.  Can someone please tell me the diameter and thread pitch of the early B/RB temp sending unit?  I'm guessing 1/4-18 NPT, but that's just a guess.
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