Regarding gas pump and ATM skimmers, the safest bet is to simply not use any card at the gas pump, period.
Instead, pay inside the gas station, ideally one with a chip reader at the terminal. If you're going to pay at the pump, however, at least consider using a credit card instead of a debit card. For ATMS, use those located inside secure areas.
The picture of the gray wires comes from a gas pump in The Colony. These skimmer devices can be bought online and some (the NFC device pictured) can be used with Bluetooth technology, with the scammer nearby in a vehicle. These skimmers can be placed on ATM machines and gas pumps. Inspect the device you are using and check for suspicious items!
Remember....."If you see something, Say something"!!