On 12/4/2009 4:37 PM, Chris Kantarjiev wrote:
>> Chris, I'm not sure I understand this statement.
>
> My experience with the electric tach conversion in my TR4A is that the
> tach is not very happy. I wasn't able to do careful measurements but the
> little that I did led me to believe that the voltage was likely to drop
> *below* the critical voltage of whatever regulator is now inside the
> tach shell!
>
> In another car, I've had problems with voltage swings and electronics -
> a rally computer, something *made for automotive use* would reset itself
> mid-event, apparently because of voltage issues. The manufacturers
> realized that this was a problem and sell another box to do "voltage
> conditioning" :-)
>
> Dunno. All in all, a mechanical tach might be a better way to go in our
> old cars!
I'm sadly coming to the same conclusion. I thought about designing a
voltage conditioner, but decided I've created enough "side projects"
with this car :-/ To compound the voltage problem, many of the tachs
I've looked at won't work with my Crane ignition, and there's no chance
I'll give it up.
jim
--
Jim Hassall
Blacksburg VA
'63 TR4 in autox preparation
99% finished, 90% to go
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