Here is my problem. My 03 speedometer worked fine with the AEM ecu. I replaced the ecu with Haltech and harness specific to the S2k. Everything works just fine except the speedometer. Zero only. I have checked fuses, sensors, etc. Wondering if anyone else has done this swap and if they had problems. Only thing I can think of is a pin location problem or a needed resistor. Appreciate any help . Thanks.

 

Make sure no pulldown resistors are either attached or selected in software. S2k speedo needs pullup

 

Thanks. I'll check that out.