One simple brass fitting will do it on your oem intake, If I cant find the fitting today I will post a pic of it when in use.
I used this fitting on a 70 6bbl intake so I dont see why it would not work on a 4BBL.
Still lets the tip of the sender be in the coolant flow and it seemed to be accurate.
I will see If I have a extra one if you cant source one.
So I need to remove the larger,outside adaptor that is on the sender probe now and find an adaptor to fit the OE sender hole and the smaller fitting on the gauge/probe correct? Thanks Mr Potato