Did you purchase new CryptoPay devices or used? Grey wires are attached to the back of the CryptoPay devices with the other necessary wires. They attach to the
coin signal. You can find a diagram via Google as CryptoPay has it online.
That said we never found them to be accurate as they count
coin pulses and the CryptoPay devices trigger
coin pulses too when cc is used. For some reason they are always off. Our
coin scale is perfect as I compare it to the bank count/sort. If you want an accurate
coin count and have Dixmor timers I have found the counts on the timers to be fairly accurate. You just need to reset them after emptying
coin box or note the count. Easy and quick to do either approach.