This was installed on my 1986 Toyota pickup. Fits perfectly. I added 2 ounces. Oil PAG46 and twisted. After charging my system, it blew COLD air. The sight glass actually "works" but you can't use it as a guide as it was designed for the R12 system. All I know is that it showed that I was in flow and the air was nice and cold again. For the price you can't go wrong.
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