never missed a lap count... on my Rx the 4th port is reserved for telemetry so I can't draw power from it for the fan nor PT which is why I spliced both the fan and PT together into Ch3 slot. The only limit you will have is dependent on the strength of the BEC on your ESC, most modern ESC's will do fine and not need any capacitors (glitch busters) added. If you are running an older Castle ESC then, yeah, they are known for having weak BEC's and will need a glitch buster added.