could the low pressure switch also called a cycling switch...

i just lost my shift key and gained 2 pounds of r-12 and a working a/c system, except for a cycling switch...question..

the shop were i had the system charged at suggested that i install a new cycling swith, they wanted one hundred dollars for it ... is it a low pressure sitch..

i've got to get that shift key working, it's hard to ask questions without that mark.

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1993 w250 Dodge cummins,wvo,tweaked pump,etc
1969 Baja bug, vert, 3x3, mid travel, 1914, fun
1979 300sd not so bad