Kv daul nand help

i really dont understand how a kv work on daul nand i know i have to add another kv so my retail nand do not get banned but the thing i do not understand is how do i know i put the kv on the right nand? also if a have 2 kV’'S how do i know what kv is being used on the glitch side?

im also looking for kv’s to buy

Because you use the switch to change between the glitch and retail. You can not change the retail nand, only the glitch the nand. So when you change it to the the new KV it is different from the retail.
Your questions are answered by simply switching between retail and glitch.