I *think* this is the one that is being shown in the picture, but I can't tell for sure?

I was originally going by this pic, and couldn't figure out for the life of me what the heck was going on, it wasn't til I looked at it again that they said it was for a 1st gen.





Here's the other pic I saw:


Here's my truck, with the port in question:





Or, is it this one in the back? I thought I read that it was a square plug?

 

That's the one you want.

 

Excellent, thanks! I've got to go to Lowes since the fitting that Autometer gave me won't even thread onto my gauge. I'll see if they've got a 90* fitting there as well so I can go straight back with it.

 

Is this the same port for my 1996 3500 ??
Wayner

 

*****Yes**********