Strange Oil Sender Fitting

[1968rt]

I was taking apart a 67 440 HP and found this strange fitting. Has provision for a sending unit and a mechanical gauge. Is this a stock piece? Thread broke off the bottom, but I can braze a new one back on it.

 

[Jerry Hall]

Not stock. The light sending unit in it looks stock, but the fittings is not. It's old though so a day 2 piece I'm sure.

 

[4mulas]

Just a rudimentary T to run an idiot light and a mechanical gauge