[TitaniumTT]

Originally Posted by infernosg

I'm now working on the custom gauge cluster. I'm using analog gauges and the tachometer is still going to get its signal from the Haltech but I need to identify a source for the speedometer. I can theoretically use any signal for the speedometer as long as it produces between 4000 and 200000 pulses per mile. Some options I'm considering:

1. Keep the mechanical speedo cable and isolate the speed output from the stock cluster and use it as a signal source.
2. Hall effect sensor + trigger/magnetic pickup wheel on the driveshaft (there are some pre-made options out there that look like they'll work).
3. Hall effect sensor + trigger/magnetic pickup wheel on a front wheel hub (a la TII ABS sensor)
4. Use FD VSS (will this even work in a N/A transmission?)

Thoughts?

Originally Posted by C. Ludwig

I believe there is a shop that makes a Hall effect speedo drive that swaps in the TII trans. Forget the name. Search on the evil forum. It may work in the NA trans.

The FD and Miata trans senders use a VR sensor. If one swaps to the NA trans it would work with an A/D converter.

There is nothing really better about a Hall sensor. VR sensors generally are preferred for something like wheelspeed where there is a high resolution target. Just need an A/D converter for your gauge and ECU that want to see a square-wave input.

I believe its called Speedometer solutions in MN or WI or somewhere around there. They have a unit (or they did anyway) that will thread into the tranny where the cable did. It outputs a hall effect signal that just about any aftermkt speedometer will read an interpret. Cost when I bought it some 7+ years ago was like $75. Worked really well for me until I went full traction control and needed inputs from all 4 wheels. This option will give you driveshaft speed which will get interpreted as speed.... not useful at all for traction control.