Inaccurate Tachometer?

[infernosg]

Thread revived!

Originally Posted by TitaniumTT

The most accurate way to get readings is not going to be from an analog gauge, but rather from high quality electronic sensors, really sheilded wiring, and digital displays.

I'm halfway there. The tach is now being run by a Haltech but I'm still using the stock speedo cable until I rig something up for a Hall effect sensor or the like. Too bad I didn't jump on those trigger wheels being sold a while back. I'm not sure about a digital display but one day the car will have a custom instrument cluster.

[infernosg]

Originally Posted by infernosg

I'm halfway there. The tach is now being run by a Haltech but I'm still using the stock speedo cable until I rig something up for a Hall effect sensor or the like. Too bad I didn't jump on those trigger wheels being sold a while back. I'm not sure about a digital display but one day the car will have a custom instrument cluster.

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?