Speedo's - No, not the ones you wear

[John & Patricia Donnelly <pdonnel1@san.rr.com>]

Over the last 35 years I've put up with a wavering and often an eratic 
speedometer. After looking through the Moss Europe catalog I see a 
Smiths electric tach, but not a speedo. Is there a company that makes 
electric speedometers that will fit our TR's? I cruised the web but 
didn't see anything.

And, if there is one, how does it detect the speed? Is this the same 
detecter as a speed control would use, or is it still a mechanical input?

Johnnie
'67 TR4A
'71 P1800E