Honda oil pressure switch How to put a gage on it?

If you're using a mechanical oil pressure guage from Autometer all you have to do is remove the stock sender on the back of the block and install the fitting that comes with the guage. You might have to thread the hole to accept the Autometer fitting, because Honda is metric and Autometer use's NPT fitting with their guage kits. After you have the fitting in you can install the oil line. Run the oil line into the cabin of the vehicle and to where ever you have mounted the guage, wire the guage light and button everything up and start the engine and check for leaks.

Also Autometer has a stainless steel braided line kit for this application. I highly recommend paying a little bit extra for it, the nylon hose that come with the kit tend to get brittle and crack. Nobody wants oil in their car! I also recommend putting Teflon on all fittings as an extra insurance against leaks.

There is no point in using an electrical guage for a fuel pressure guage you might as well keep the stock unit.