Speedo going mad with 1258

[Jnunu1]

Hi. Just plugged my new savox 1258 into my spektrum receiver, turned it all on and..... massive glitching, speedo making constant beeeeep and red led flashing and the rx green light flashing on and off!

My speedo is a cheepo 35a hobbywing ezrun. I am guessing that its too weedy to power the servo? Am i right? If so, is the only solution a new speedo?

Cheers

John