Not all 540 kit will overheat, I ran a castle 3800 4pole with the SCT sidewinder speedo in my Slash for best part of a year with not issues at all and never maxxed it out as normally race indoor, it was geared to make 40mph and handled it no problems.
I think the biggest issue here is the speedo getting hot because the motor is drawing a lot of power through the ESC due to the weight of the car, try a smaller pinion to control temps but if you lose too much speed then you will need to start upgrading kit. Tekin kit can handle some heat, anything upto 170f is deemed OK.
I have the same ESC in a Cougar SV and even in that little light weight car it still gets mega hot running a 6T motor?
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