Jordan
It 18 tpi, so as Alex said, NPT. It appears to be a parrallel thread, as your picture and mine have a copper washer under them. These things go on the hole size for volume flow, so it will be 1/4 NPT (BSP is 19 tpi) The other end fits the ford sender.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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