Two things, never add more charge than a clear sight glass with the car running...Also with the gauges, you are not getting into the high side valve. I have had this stump techs. You will have to correct the valving. Do not overfill with 134. Be sure to run the auxillary fans on high by bypassing the fan resistor and updating the fuse.
1992 500E (very soon I hope
1981 280GE SWB
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