I used the hobbyking one as was about 3 pound and worked and still works fine even using spektrum and savox full size servo and just soldered two wires straight onto battery wires then plug into speedo, only issue is it bypasses the on off switch so powers up as soon as plug battery in
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Schumacher kf
Schumacher sv2
Durango Dex210
Carisma gtb x2
Schumacher gt12 x2 
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