307 Oil pressure & temp sending units

[Flatbed136]

Please bare with me as I explain this as I'm a green horn.

As you can see from the picture, there is currently an after market set of guages.

I would like to hook the factory gauges back up.

The guy I got the truck from told me I had 327 heads. I ran the casting numbers from the head on the drivers side and it shows it is a 350.

Casting number is 333882. I have not looked at the other one.

What size threads or sending unit will I need for the temp guage?

The block casting numbers show it is either a 307 or 350. Was told since it has a thin or smaller harmonic balancer than more than likely it is a 307.

What size threads or sending unit will I need for the oil pressure?

The oil pressure is currently located by the distributor with a plastic line.

Any help and information would be greatly appreciated.

Thanks for your help.