oil sender switch

[SportStang]

I just finished dropping in a 91 302 carbed motor in a 68 coupe. My question is can I use this oil sender switch(lights) image attached or do I need to go with the older 68 fitting (hex pipe) and sender unit (gauge).

 

[Tim65GT]

If you have an oil warning light, then you would use the low oil pressure switch you show.

If you have a gauge you would use an oil pressure sending unit:

The purpose of the hex extention is to bring the sender out away from the oil filter and fuel pump to a location where you can get to it. You may get the smaller switch in there, but I think the bigger sender would hit without the extension.