Now im going against everyine and saying that it doesnt seem to matter what they run a teesside from 6.5 to 3.5.
For the mamba speedo i recomend looking at the Mtronik plasma PRO motors, being sensorless they will be spot on for that speedo
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Canon 40D (350D backup) - EF-S 18-55 - EF-S 17-85 - EF 100-300 - EF 50 - Canon 430 EX || Speedlite - Canon BG-E2N Grip
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AX-10 Crawler - Thats all I have left!!!