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1. 08:09 AM - Re: Re: Which Oil Pressure Switch? (Robert L. Nuckolls, III)
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| Subject: | Re: Which Oil Pressure Switch? |
At 11:43 AM 5/8/2023, you wrote:
Been out-of-pocket for a few days . . . returning
to the 'oil pressure switch thread' . . .
>=C2 Either way works. But I'm mystified as to why
>=C2 the SureFly would depend on Slick operations
>=C2 to provide a tach signal . . .
>=C2 Bob . . .
>
>I suspect that what he's saying is that the
>Surefly doesn't output a tach signal usable in
>the same fashion as the mag p-lead signal.
>Therefore, there's no signal to any electronic
>tach if the mag is off. Pretty common situation
>with aftermarket electronic ignitions for Lycs.
Aha! but of course. Given that a hall-effect
tach pickup has been added to the conversation,
making that signal activate the hour-meter as
well is easy. Of course, there's a further
benefit that the tach/hour-meter functions
are independent of conditions of either
ignition system.
I've sketched out an adapter circuit that would
interface the square wave output of your tachometer
pickup to the hour-meter.
The suggested transistor is hugely 'too-robust'
for the task but it's in a large package that
yields to 'spider-web' assembly of the components
directly to the transistor case before protecting
in some suitable encapsulant (E6000, JB Kwik, etc.)
Alternatively, this could be assembled on some
form of prototyping board in which case, ANY
logic level n-fet would be find.
If you wish, I can hammer this together out
of my junkbox. It would be fitted with flying
leads for interposition between your tach and
hour-meter.
Bob . . .
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