pressure/temp sender help

Hi I am new to forums so if i screw up - sorry!

The engine in question is a 440.

I have three Autometer gauges i want to install this weekend. I have water temp, oil pressure and temp.

So far i have figured out (and correct me if i am wrong) that the water temp sender is at the front of the block next in the water pump, and the oil pressure sender goes into the hole at the top of the back of the block. I have two holes here , both have plugs.

My question is where does the oil temp sender go? I assume it needs to be submerged in oil to get a proper reading. So would there be a factory location for this sender or do i need to drill one? If there is a factory hole for it where would it be, and if not, where to i put it???

Thanks for any help. Pics would be very much appreciated.
Author: 71_Duster