Speedometer programming

[one_dusty_hoot]

Don, I believe the dip swiches are set to a ratio that
is the calculation diameters, circumferences, or teeth.

For instance, if the pick up was from a toothed wheel
hub, it may be the resultant ratio of distance, wheel
circumference,and time.

I have seen such calculations before but can't remember
where except that it was from a gauge supplier, Telefex,
Stewart Warner, etc. Check the Mfgr for instructions.

Another possibility is the distance (gap)between the tooth
and reluctance pick up but usually would count lower not
higher, 15-20% is way off, may be the counting circuit in
the speedo?
Best I can do for what little I know.

bob janes, 87fc35, greenville, sc






--- In WanderlodgeForum@yahoogroups.com, "Don Bradner"
wrote:
>
> The speedometer on 90 PT40 reads roughly 15-20% high. Presumably
racks up miles at a higher rate as well.
>
> The VMSpc speed reading appears to be just about dead on; I would
like to improve the accuracy of the speedometer, and I wondered if
anyone here has any info on the programming?
>
> On the back are 12 dip switches. 1-4 are labled "Ones" and 1, 2, 4,
8. 5-8 ae labled "Tens" and 10, 20, 40, 80. 9-12 are labeled "Filter."
>
> Only 2 and 4 are on (values 2 and 8).
>
> This is an obvious question for Bluebird tech support, but so far
on other issues I'm batting .000 with them (meaning I have yet to
talk to a human) so I thought I would ask on the forums first in case
someone has previously received programming info.
>
> Don Bradner
> 90 PT40 "Blue Thunder"
>