The temp sensor in the back corner of the 12v head is 3/4" NPT. There is usually a couple 1/2" NPT ports under the intake plenum, too.
The inlet of the piston lift pumps I have dealt with is 1/4" NPT, some are bigger but can't remember for sure if it's 3/8" or 1/2".
1/4" NPT is dangerously close to 14mm x 1.5.
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DRIVER: 1993 W-350 CC SRW
PULLER: 1989 W-350 RC SRW
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