This little handy fitting is very useful for those running the forward facing housings. As you may have noticed, those housings are very limited regarding how many fittings you can have installed into them. This fitting will thread into the filter housing and will allow you to keep an oil pressure gauge and a turbo feed line installed. (skip the idiot light, it is not that useful).
(please keep in mind this is NPT thread, not BSPT thread and you will have to run an NPT tap in your filter housing for the best seal)