At 07:45 PM 1/12/97 -0500, you wrote:
>
>>John, maybe its me, but I never saw an acurate speedo on a T type. My TC is
>>chronomic and moves like a second hand of a watch. The TF works by varying
>>at speed by twenry miles per hour. I could on the TF take the average of
>>those swings, and subtract 10 or do as I actually do, ignore the speedo and
>>look at the tach. The PA has no speedo, just the tach, and thats all you
>>need.
>>
>>Mike
>>
>>
>
>I've had the speedo from my TD apart and wached it work. It seems to have
>a digital nature. It looks like it counts the revolutions against a
>time base. There is gear shaft that moves in and out periodically
>engaging and disengaging the gear. The needle twitches in sync with this
>time base. Anyway it all seems to be all done with gears. The tach seems
>to work the same way. Does anybody out there know how this works?
>
>Bob Donahue, Still Stuck in the '50s
>rdonahue@holli.com
>53 MG-TD under DIY restoration
>71 MGB still in shop, 14 months and counting (the TD is winning)
>
>
>
>It sounds like you have the early kind, (flat face) which like the TC is
chonomic. In either event my remarks are still the same.
Mike
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