Its a car but an electric one I am building. I would post a link to the thread but I'm on my phone. Anyway yes it is a car but the car is electric and it would be rarely used out doors. I am designing it for use inside a large building. I think whatever is cheapest is best. As for wire gauge, yes I am making sure that my gauge is big enough but just to cover my bases, what is a good size? And if I don't have that size, will multiple wires of smaller ggauge accomplish the same task? Like if I need an 8 gauge but I have some 14 gauge, would doubling up on the 14 gauge be sufficient? Note: that's just an example, not the actual numbers I'm using.