Are you sure.....
They should all be the same.....
Here's a picture from an 89 or a 90 XR-7.....
You can see both red and blue caps.....
The next picture is from my 89 SC....
The line is out, but the connector is in the red circle.....
I checked the bottom of the hose and no such luck it doesnt have a low pressure port on the bottom of that line either. the 89 was origionally an R12 car but mine has a sticker saying it was converted but there is no port. can it be charged from the high pressure side or do I need to get a new low pressure side hose and recharge the system?