Negative Battery Terminal to Engine Ground

I have been thinking of doing a big 3 upgrade for the grounds, but couldn't make sense of where all the wiring was going to go. I have a 2000 Access Cab, V8, 4WD.

For the life of me, I couldn't find the last ground. I could obviously see the negative terminal to body, right by the battery, and I could obviously see the the cylinder head to body on the passenger side, but I had no idea where the negative terminal to engine ground was. I finally found it today, just muckin' about. It is located right near the upstream O2 sensor on the driver's side.

Here they are, as I didn't find any info on here showing all three grounds, just one here or there, and none showing the negative terminal to engine block.

1) Negative terminal to body:



2) Head to body:



3) Negative Terminal to engine/block:

 

Good info. Thanks.