AC low side charge port

[95 ram]

Hey guys, got a 95 Ram turbo diesel. Need to fined a way to hook gauges on the AC system. I can't seam to fined the low side charge port. Any help would be great. Thanks

 

[dodge dude94]

The high side port is on the fender and the low side will be coming off the accumulator going to the compressor. That line should be larger in diameter than the other.