R134 retrofit question: Which is low and high pressure line in 92 22re?

[LeftCoast]

Hi,

Trying to convert the A/C to r134, but not sure which line is which? One is a line with a red cap that's @ 4 inches past the firewall, on the passenger side. The other has a black cap, and is pretty near the a/c compressor, around the front of the motor. Am I correct that these are the service ports, and which is the high pressure side (and which is the low pressure/fill line? Or if I'm wrong, where is the correct port(s)?

Thanks in advance.

 

[LeftCoast]

Never mind...I think I figured it out. Red is high (thin line), and the black is low (larger line).. bonehead.