Well if you have a 1001 (they were 7.2V right?) try that, if it goes away then you've narrowed down your options. You can get Y leads that you could then add the cap into.
I must admit I hadn't considered the receiver, could be, being that age it's more sensitive than modern receviers for voltage, though again the cap might fix that.
Other options, can you borrow other speedo to try, something with a bigger BEC output. If you're running brushed I remember Novak (GT7) and Tekin (G10 / G11) both had big outputs, 6.0V 5A IIRC.
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