Sorry to ask such a basic question, but does anyone know the thread
dimensions for the plugs that Mazda uses in the 13b, I'm looking to make an
adapter for a Fluke PV350 pressure transducer for a compression tester.
Combined with a peak hold meter it would make a great tool for the shop.
Thanks,
C. Smith

Dang! My thread gage is out at the hangar.

Cut up an old spark plug for the base.
Recycle :) Anybody have any old spark plugs they can send
to C. Smith?

Paul Lamar