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You are pn the right track, but there is more info you need.
Q#1, yes the connector will be different. When a car is converted to R134 there is a special sticker that is supposed to be placed somewhere in the engine bay.
Q#2. If the hose on that thing is actually as short as it looks, you will have holy hell getting the job done. I found two ways to get at the low side port, and neither is any fun.
a. From the top, after removing the AMM for access. Attach hose, replace AMM, start car, connect R12 can and fill. REmove AMM to remove hose after filling is complete.
b. From the bottom, so as to avoid removing AMM. My gauge set has long hoses and a slight curve in the fitting for the low side. I am able to snake the hose down into position, after putting the car up on the oil change ramps. Then I can finagle (30 min fussing) the fitting to proper connection, get up and do the fill job.
Q#3. There is a sight glass on the top of the receiver/dryer. Clean the glass and look inside while the A/C is running after having been run 30 min or so. If you see "soapsuds" you can probably use the entire can. If you see just a bubble now and then, the system is full. If you see almost nothing, the system is either full up or totally empty.
There is a label on the driver side fender stating the amount of R12 in a full charge.
Q#4, Correct on all counts.
Q#5. If you were to take the car to an A/C shop for the job, the majority of the expense would be the R12. Find a shop. It'll be a lot easier.
Good Luck,
Bob
:>)
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