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I got my guages at HF cost me 40$ because it was already on sale and i got a 20% off coupon which you can get online just do a search.
The ac vacuum pump was kinda expensive for me and i already had a large compressor so i purchased the kinda that hooks up to the air compressor under 10$
When you pull a vacuum you should get about -30 psi on you're guage or close too it. once you shut off you're low and high side valves it should hold whatever pressure you were able to achive for at least 30 min to 1hr but i check it after 5-10 min bc if it has droped by then you have a huge leak.
there is usualy an dirty oily residue when there is a leak. mine was at the front of the condensor were the 2 lines connect. and there are some cans of r134a that have some UV die in it to help you find a leak with a UV light which works best at night. this is assuming you system is low and you have to recharge it up and you're a/c pump should probly turn on with about 1 can of freon.
i have a linke to a whole 288 page book if you need it. it was very helpfull to me and helps make sense of alot of things
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Jaime O.
Thank god I crashed or i would never have owned a porsche
83 944 daily driver (clutch and tt time)
85 325e BMW T-boned R.I.P.
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