[Vwdiesel] Diesel Tachometer in an older VW

[brian gochnauer]

I was investigating creating a divider (having an electronics degree) to
solve this problem and found a 'programmable' divider on Texas Instruments
site CD4527B (CMOS BCD Rate Multiplier) which is and old design really,
called a 'rate multiplier' but can do fractions (dividing) of a frequency. I
wish I had a gasser instrument cluster to try it on.
But then I started thinking, if VW was smart they would have made the
instrument cluster programmable to begin with, so depending on different
trannies gear ratios (speedo pulses) and engines cylinders (ign.
pulses) they could have a single part manufactured and make a setting for a
particular car.
Maybe someone on the list has a inst. cluster and has a electronic
background or a friend with electronics experience that could look the
cluster over and see if the is a 'programmable' part plug-in chip or dip
switches (or wire jumper set) on the cluster board.

Brian

On 8/24/08, Tony and Lillie <tonyandlillie1 at earthlink.net> wrote:
>
> I've thought about putting a crank position sensor on the Cam gear, as a
> last ditch effort. However, I'm sort of hoping there is some sort of easy
> divider device or otherwise I can use. Although, the cam position sensor
> would be more accurate. And, I do have a bunch of misc crank position
> sensors left over from various engine replacements/swaps. But, I'll go that
> route only if I have to. I've completely rewired the car with a generic
> wiring harness/fusebox. And, I still have the stereo, vent modification,
> wiring for the heater controls, etc. So, I'm not looking to put a bunch of
> time into this right now, just hoping for something simple I can buy.
>
> As for the speedo, I've got the theory figured out. I just have to figure
> out the mechanicals. The speedo cable in my car has a bracket on the end
> with a screw holding it into the trans. VW has several different styles of
> electronic senders that mount to their transmissions, and they all opperate
> off a gear just like the cable does. It's just a matter of which setup will
> allow the easiest mounting to the trans.
>
> And, thanks for the compliment, Kneale.
>
> Tony
> ----- Original Message -----
> From: Kneale Brownson
> To: Tony and Lillie ; LBaird119 at aol.com
> Cc: vwdiesel at vwfans.com
> Sent: Sunday, August 24, 2008 8:48 AM
> Subject: Re: [Vwdiesel] Diesel Tachometer in an older VW
>
>
> Being the whizz you are, Tony, I'd think you could figure out some sort of
> hall sensor devices to supply the signals you need to make  the speedo and
> tacho operate appropriately.  Maybe one reading crank spins and one reading
> output shaft spins???
>
> _______________________________________________
> Vwdiesel mailing list
> Vwdiesel at vwfans.com
> http://www.audifans.com/mailman/listinfo/vwdiesel
>