Peter,
When I installed the Horton on my previous 92 and was putting on the A/C high pressure switch on the test port, I thought they left off the O-ring so I put one in the connector. Wrong!!! It leaked Freon!! It is a metal to metal connection and worked great after I removed the O-ring and recharged the system. Live and Learn!!!
Bill
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97 3500CC,Auto,4. 10LSD,All Options incl Leather,Pyro,Boost,Trans. Temp Gauges, PacBrake, 3 pos TC Lockup Switch, RPM 40Gal. Aux. Fuel Tank, Reese 20K Hitch, Highway Products Tool Box, 80% Towing 12,100lb. HitchhikerII 5'er. 2000 3500QC 6 Speed,4. 10LSD,SLT+ on Order since 9-28-99, Built 12-01-99, On Train, Passed Guthrie, OK, 12-6 @4:39AM, ETA Alliance(8 miles from my house),TX, 12-7 2PM