Quote:
Originally Posted by THEFERMANATOR
I believe the -10 means a resistor plug to prevent electrical interference with VHF radios and LORAN-C(when we still used LORAN C).
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Actually the "R" means resistor, the 10 is 1.0mm gap.
neat link
http://www.sparkplugs.co.uk/pages/te...-plug-code.htm