The end of your R-134a tap that connects to the Schraeder valve likely will not connect to an R-12 Schraeder valve. I see from your photos that this product was made in Mexico. It's quite likely you were sold R-134a and charged an R-12 price.
I'll bet the EPA would like to talk to the guy who sold you this product.
E-bay unfortunately is a breeding ground for unscrupulous people.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.