Maybe you guys should look at how other nissan engines are setup. Ka24de,RB2xdet(t),sr20det all have oil squirters that I know of. My ka24de taps directly into the main bearing galley for the oil squirters.
Yes it is adjustable. S14 240sx speedometer has the same thing.
Freshalloy.com and zilvia.net come to mind, I know it has been posted there before. Search for speedometer calibration
No I am not saying they are the same. Only that I did the conversion to an lines/fittings like you're planning to do.
Sorry I dont know what size the lines are on the Z, as I just purchased my first Z and haven't had a chance to dig my hands into it yet