The hole is much larger than 1/4 inch. It looks like 1/2 inch pipe threads?

1/4" NTP means
the minimum inside diameter of the fitting is 1/4" or about 6mm

the actual threaded hole for the rev switch is about 14mm

I bought a oil plug for the hole, I cant remember the exact size but its something like 17mm x 1.0 pitch - fits perfectly.

well found the suzuki switch is m14 1.5 thread pitch.


can anyone confirm datsun one?

wow, sunny or b110 to b310 and vanette and so many other nissans are also listed as m14 x 1.5... i think i found one close to size if pic is correct

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m14 x 1.5, there are two switches for Datsun. One has a longer button on the end of the switch

Here's how some guys have done it: To fit a 60-Series Transmission 5-speed, move the mounts 115mm back in the Tunnel:

I thought of getting a mini-pushbutton switch with a 1/4 barrel which would easily fit via tap down through the 14mm shaft. Problem was the button part was plastic...might have found one of similar dimensions but with a metal button... I guess it depends on what pressures said button can withstand...(a broken button inside the gearbox mightn't go down too well)...but with this method it would stick out no further than the nut itself.