Going to install my oil pressure sending unit soon, heard the hex bolt down by the filter is a pain to get out. I don't think I have a hex key big enough so I might go run to sears and buy a hex key for a ratchet, anyone know the size of it by any chance?

 

Try 10mm or 12mm hex bit.

 

It was an 8mm, found out the hard way...oh well they took the hex key back cause I didn't use it.

 

It is 8mm. Make sure you get a 3/4 drive socket. You will need as much leverage as you can possibly get in order to remove that plug. I just finished removing mine about 5 minutes ago WD40 might also be required. Make sure you also have some thread sealant/teflon tape.

 

I bought the sockets but it was tough to get at with a ratchet, the extension made it hit the control arm etc...so I used a regular L shaped allen key and put a pipe on it.