Digital Speedo

[Amcis]

Hi,

I have a VP Berlina, and wish to make a digital speedometer, to acompany the original one on the dash.

My plan is to mount the disply, in the space under the stsreo, behind a perspex plate.

Does anyone have a schematic of the circuit to do this?

if not, I was going to buy the digital speedo/speed alert kit from Jaycar electronics.

I found the Speed Sensor wire and where it connects to behind the dash. Can someone also tell me, what signal these has, eg.. voltage, ohms, etc..

Is it possible.

Adam.

 

[Jimbo]

Digital speedo/tacho,.. just pulse counters appropriately scaled.

I'd take the senser output, in your VP, it should be giving you 10 pulses/rotation, clean the signal, (you mention elsewhere that you're into electronics) and use that as a base. You'll also notice that the cluster itself scales down the pule rate before it feeds it back to the ECU, this might be a cleaner signal for you to use.

A project I'll get back to doing one day is, 'altering the pulse rate', to accomodate different diif gears - I was going to do this with a suitably programmed PIC. I've done most of the leg work on what I need to do just need to go through the actual program/testing bit.

 

[Naccas]

I had the Jaycar kit in my old VL and it worked pretty damn good. Update time was a bit slow but it was still good to have a back up to my analog speedo.
I picked up the pulse signal off the automatic gearbox computer (which was seperate to the ECU in the VL).

It was a good talking point as the rest of the car was pretty ordinary.

Cheers,
Naccas

 

[87-VL-Commodore]

Hey naccas, how much did that cost you man? I want to put cruise control and speed alert in my VL because I'm sick of getting speeding fines for doing 4k over!

 

[Naccas]

The speed alert kit was about $65 (from Jaycar) from memory and took me probably a couple of days to put together.

Incidentally, I also installed a cruise control kit too, probably the best feature of the car, made long distance trips a lot easier, no more cramped legs/feet.

Cheers,
Naccas