There is a simple reason for this. The amp gauge should move up and down as you drive it's simply showing what the bike is pulling.
wire gauge is used to determine the size of the wire to be installed based on the amperage draw of whatever is being hooked up on the receiving end. ie 14 gauge is for a 15 amp circuit, 12 gauge is for a 20 amp circuit, 10 gauge 30 amp etc. to get specific amp draw ratings on a particular gauge of wire look at a current National Electric code book or ugly book.
10 gauge wire will only run up to 30 amps
The temp sending unit or gauge is bad, probably the sending unit.
You'll need RCA style cables to connect from your headunit to the amp. You'll then need Speaker Wire to run from the outputs of the Amp to the speaker terminals. You'll also need a heavy gauge power wire. A wiring kit such as the StreetWires Power Station PSK04Ri 4-gauge amplifier wiring kit.
Your thermostat might be stuck open
40 on idle up to 60 while on the move.
Hook your speakers up to the amp.
its casing will dry out, crack and catch fire, or it will crack off and cause arking, which can cause a fire... ultimately, check the gauge size of the circuit and make sure it corresponds to the proper amperage of breaker, if this is all good, you need a bigger cord(the gauge size must be sufficient for the intended tool/device.. a drill that has a 16 amp rating needs a 12 gauge cord whereas a 12 amp drill needs only a 14 gauge cord.
I am assuming that this is a one and a half HP motor. To wire a 120V 20A motor the electrical code states that the conductor has to be 125% of the motor's full load amps. This equals 25 amps. There is no wire rated at 25 amps so the next size up is 30 amps. A #10 copper wire with an insulation factor of 60, 75 and 90 degrees C is rated at 30 amps. To carry this to a conclusion This #10 wire should be protected by either 60 amp non time delay fuses or 35 amp time delay fuses or a two pole 50 amp breaker.
Normally a new kitchen stove will require a 50 amp breaker wired with AWG # 6/3 with ground wire.
So that freight cars could be interchanged. Its easy to move people, harder for freight.
20g. But that's a regular ear piercing size. So you'll move up to 18g.