The speedometer sensor on all turbo 91-99 Mitsubishi 3000GT VR4 and Dodge Stealth R/T turbos is a electrical signal based sensor. The 93+ FWD cars are also electronic.
The sensor is compatible with the Haltech Elite 2500 and other ECUs and we will show a calibration that has proven close. It can be tweaked for your setup.
You will need to use a SPI input on the Haltech for this to work.