the only reason to change out the speedo is if you wanna run Lipo - I don't believe that version has a lipo cut-off built in, but with silver can motors I seriously doubt you'll hit the 'danger' zone on a lipo

run it and see how it works you can always look in the for sale section and find someone selling off old brushed speedos fairly cheap

you planning on running at the 'Slowbirds'??