The threads in the block are not 1/8" npt. There are 1/8" BSPT. They have the same dia, but a different thread design and pitch. If you install a 1/8" NPT into the Honda block, you will destroy the threads. When you add that heavy aftermarket sender the vibrations will eventually crack the block.
There are two ways to add a oil pressure sender unit safely. You need the following adaptor
http://tunertoys.zoovy.com/product/O...al_Outlet.html to properly fit the block and offer a pickup point for a a sender unit with an extension line.
Here it is installed along with my cam tower oil supply line
The other option is to use the oil filter sandwich block like this.
http://tunertoys.zoovy.com/product/G..._GVC10018.html
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