speedometer replacement

[Don Bradner]

I always try to simplify formulas where possible. I suspect it was the sheer
number of decimals used that lead to your making the math error in that top line
- when you make an error that affects 5 of the 6 digits you are fortunate that
rounding got you to the right answer.

The teleflex document is of necessity a complex one, because of the many
different speedometers involved. It just happens that OUR 85MPH speedometer is
the one where the .0236 and 23.61 can be cancelled into a simple 1/1000.

Thanks for the info on the pickup - I had thought that it might be coming from
the DDEC on mine; internally my DDEC II stopped recording miles (but still has
MPH) a few years ago.

Don Bradner
90 PT40 "Blue Thunder"
My location: http://www.bbirdmaps.com/user2.cfm?user=1

On 8/27/2011 at 10:17 PM Ralph L. Fullenwider wrote:

>Don:
>
>The last magnetic pick up or Proximity switch, same thing, that I replaced
>was on a '95 Bird, so I know it was there up to that year model and I do
>not know about further years.
>
>Another thing that I know, the math that I reported on to set the simple
>binary switches up for the divide number and the Hertz rate worked. So why
>confuse with mumbo jumbo of equation changes from a known good formula
>written for the Teleflex gauge. My install and use of the programming from
>the web site I published to anyone needing it, worked very well without
>your change.
>
>Safe travels,
>
>Ralph and Charolette Fullenwider
>"84FC35 "Ruff Diamond"
>Duncan, Oklahoma
>
>At 04:21 PM 8/27/2011 -0700, you wrote:
>>Do all Birds use wheel mounted vs transmission mounted generators?
>>
>>Note that there is a math error in the top line below, but it does not
>>affect the rounded end result.
>>
>>However, multiplying by 0.0236 and dividing by 23.61 is funtionally the
>>same as dividing by 1000, so
>>501 x 60 / 1000 = 30.06 which is close enough to the 30.047 that using
>>.0236 and 23.61 would give.
>>
>>On 8/27/2011 at 4:39 AM Ralph wrote:
>>
>> >501 x 60 x 0.0236 = 710.832
>> >This number is the HZ rate
>> >
>> >Now we take the HZ rate number and divide it by 23.61, which is the
>> >constant for the divide number and will give the binary number that is
>set
>> >up on the program switches in the unit.
>>
>>
>>
>
>
>
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