I have a 1989 IROC-Z Camaro 5.0L TPI auto 700r4. my problem is i bought aftermarket gauges with a mechanical speedo but the factory VSS will not fit on this gauge. so i bought one from stealth conversions. and now im not sure what wires go to what i dont have my old cluster anymore and the instructions do not help me out at all. the factory one came with 3 wires. one power, one ground, and one signal. but this one comes with 2 wires only. if anyone knows anything about this can you help me out? if so that would be greatly appreciated.

Thanks