[Healeys] Fw: BJ8 Tacho Upgrade and Digital Speedos

[HealeyRick]

There is another option to retain the car's original speedometer and using
a GPS driven motor that is just coming on market now:
http://www.classicautoinnovations.com/#!blank/cvdf

Rick Neville

On Sun, Jul 10, 2016 at 1:27 PM, Roger Grace <roggrace at telus.net> wrote:

> Recently went to Wales to collect my stepper motor converted tacho. and
> now installed.
> So far very good; nice bright red ignition led indicator and led back
> lights.
> They also changed the face text from “positive earth” to negative – nice
> touch.
> Proper digital stepper motor (BTW Nisonger and others ? don't do this) so
> no more calibration or analog issues, or current pulses.  No mechanical
> hairspring type movement.
> Input is from from the CB on the coil and a new wire has to be installed;
> a little sensitive to routing. I use a Pertronix.
> No doubt they could also convert a mechanical tacho. to digital as well.
>
> Now digital speedos.
>
> There are 2 options.
>
> The first, that I have ordered, is to cut the speedo. cable at a
> convenient spot and install a pulse transducer. My thinking is that this is
> preferable and easier than installing a magnetic type on the drive shaft.
> They are building me a RVI instrument that will be near identical to the
> original Smiths with dished face, but with a LED display in place of the
> odo and trip.
> This will have a modern digital stepper motor drive and hopefully be
> stable and accurate. High beam indicator as before. Easy, accurate
> calibration.
> I have ordered this as MPH and so my plan, for driving in Canada will be
> to calibrate for 140 MPH as actually 140 kPH. This is easy to do and when
> in US will revert back to MPH. Only problem is that the total odo will be
> affected; may just use the trip to keep track or just stick with MPH.
> Will report back after receipt.
>
> Second option is to use an electronic digital cable drive to drive the
> original magnetic speedo with original odo. and trip, if preserving the
> original look is important. This also uses the same pulse transducer as per
> the LCD one. The pulses now drive a mini digital brushless dc motor in a
> separate box with electronic speed control. This box has a speedo cable
> output (usually short) so electronic scaling is easy but it is still a
> mechanical magnetic cup type drive. Hopefully, with no long cable and sable
> pulses the typical speedo blips etc will be eliminated. There is also some
> electronic filtering. This is the more expensive option and they insist
> they will only sell this option if you have the original speedo refurbished
> by them as well. This in the final stages of development and they have a
> large contract to fulfill in next 2 months, so realistically by Nov. time.
>
> As I will still have my original speedo. so if not happy with the LCD
> above could resort to this solution.
>
> rg
>
> *From:* Roger Grace <roggrace at telus.net>
> *Sent:* Friday, May 6, 2016 8:33 AM
> *To:* Healey List <healeys at autox.team.net>
> *Subject:* BJ8 Tacho Upgrade
>
> Seriously thinking of getting my moving coil tacho. upgraded to a modern
> stepper motor type movement, retaining the original face and case.
> Speedy Cables in Wales offer this.
> So, wondering (UK listers ?) if anyone has had this done and any comments
> about this type of conversion.
> Are there perhaps any US companies that do this as well ?
> Tkx
> rg
>
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