IDK exactly where, maybe sa performance shops like speedlab, berrima, or online. Try to ask around sa talyer ng makina, ang alamko yung pressure gauge may copper tube fittings going to the dash. Kung yang setup sa pic, its the same principle as re-locating the OE filter like what's described on the 1st page ng thread na ito.

You will be needing spin-on adapter, filter adapter, npt fittings, hydraulic hoses, and the gauge. For the gauge, you have to drill before the inlet of the filter at doon mo ilagay yung gauge to measure resistance sa filter element.

If you're serious enough, get the spin-on adapter first at yan ang wala dito panigurado, maliban na lang kung kaya ng mekaniko mo retrofit pipings like the oil cooler. The rest, meron sa hydraulic shops at heavy equipment supplies.