I got a OBD0 to OBD1 car. I have a STD hatch with a SIR II motor everything converted to OBD1. My Speedo Works even when it throws code 17. Once in a while after I drive for like 15+minutes I get Code 17 Vehicle Speed Sensor (VSS). When I first start my car when engine is cold the Speedo tweaks until the engine starts to warm up then it stays put.. I am using a 90-91 si cluster and I just check the wiring the wiring is correct on the ECU harness. I tried to clean it and put it back on that didn't help wtf can be wrong..?