Looks to me like 20-18 gauge in the picture. You can always splice a bigger wire to it and be fine, it's splicing a smaller wire onto something that can be bad. Same current in a smaller wire = heat. I don't think you want your Jeep to catch fire the first time you throw it in reverse
Edit: 18 is thicker than 20, just in case you're wondering
2013 Commando Green JK - Sold
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2014 Suzuki DR-Z400SM - 2001 Honda XR100R StockMoto Race Bike
Ohio Mini Roadracing League #201 - University of Akron Formula SAE - Zips Racing