V2 XGuard RC Back Plate Self Calibrating RPM Sensor with AGC FBL Accessories you can also use this

you can also use this servo as cyclic servo for 550-600 size

the most advanced stator design with the highest copper filling grade you can come up with and a finish you never seen before

Aluminum Landing Gear Support (1pc)

2 x Heat Shrink Tubbing for Antena Cables

V2 XGuard RC Back Plate Self Calibrating RPM Sensor with AGC FBL Accessories you can also use thisThe XGuard Self Calibrating V2 Back Plate RPM Sensor with Static discharge protection and sensor power buffering is the most advanced Back Plate RPM Sensor to date. This sensor instead of having a fixed trigger point that might work or not with your particular engine, it works by sensing the magnetic field variation of the first pulses and calibrates itself to the ideal magnetic field trigger point for that particular engine. It measures the max and