OP said he charged the system by observing the sight glass, I really doubt that the metering device is a thermostatic expansion valve but I'm only making that comparison to factory systems, it's been a long time since they used TXV's. If the metering device is an orifice and he charged it to a clear solid liquid sight glass then it's probably overcharged. I would think that Vintage Air would give specs for refrigerant weight based on the application/kit.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| 
