auxiliary oil port
You will see it has an angled boss sticking out of the center. Remove the casting, carefully drill/tap center of that angled boss for 1/8NPT and install sending unit, install casting back to engine (it uses o-ring gasket).
to that port, the lines tuck under the exhaust manifold
running toward the front. Not sure what models / years,
I've got one sitting around here somewhere. Personally
I think I'd go with a spin-on adaptor, thermostatic or
else want a cooler with the bypass thermostat so the
oil is not cooled to excess.
On another note, with regards to a oil cooler - I use a Lingenfelter Adapter in place of that casting above the oil filter, running SS braided hose with AN ends to an inline Mocal Thermostatic unit, then to a Mocal cooler mounted behind the DS lower fascia opening







