I have an 87 non-tubo and am going to running haltech with a digital dash. I know the speedo is cable driven but is there any way to modify the speedo gear so that haltech can receive an analog pulse that it can interpret as speed?

I think I've heard of people modifying them for other cars, anyone know of any write ups?

While searching I found this but nothing about using a hall effect or inductive sensor.

https://www.rx7club.com/1st-generati.../#post11403825

I'm thinking of taking the speedo gear down to the local machine shop and and seeing what they can do.

I'm pretty sure my car doesn't have ABS so I can't tap into that system.

Is there an easy way to add an ABS ring gear and sensor?

Could I possibly use an electronic speedo gear off a newer car such as a rx8 or miata?

 

The FC cluster outputs a pulsed VSS for the power steering and cruise control. I believe it's a GN/RD wire which can be tagged under the drivers side dash where the cruise module is/would be.

To be fair, I haven't gotten this working with my Adaptronic, but I know others have gotten it working on Megasquirt. There is a thread detailing all of this.

 

the stock system is trans-> speedo gear thingee-> cable-> speedo-> vss output to ps and cruise control

if you want to ditch the cable the FD speedo drive is just the VSS. it'll go right into a turbo trans, and should work with the NA also.

someone, like dakota digital probably also makes a box that outputs a VSS from the cable as well

 

Bolts right in to a NA trans as well.

 

Sweet thanks guys that's what I needed! I'll grab a speedo gear off an FD.

I am ditching the stock cluster and I am going to use a tablet. Haltech has a OBD2 adapter that I can use for aftermarket Dash cluster apps like torque pro.

Thanks again everyone!

 

Well, I've been looking and I can't seem to find an electronic speedo gear from an FD. Does anyone know where I can source one of these? Would one off a miata work too?

 

who knows. buy one and try it.

 

Maybe this is also an option:

https://trail-gear.com/301447-1-kits...rical-vss.html

This is an adapter that you screw into the stock speedo drive where the cable normally goes.

 

Do you have a link to said thread?

I would like to maintain my factory cluster but have the speed readable by my Adaptronic.

 

its in the wiring diagram, the cruise control gets a speed input

 

Since this thread, I did get a cluster on my bench and learned there needs to be a pull-up present. Adaptronic VSS input configured as digital input will provide the pull-up.

 

Thank you guys.