Speedometer issues?

[AALynch]

Hey guys,

I've got a '69 Camaro w/ an LS1/T56 in it. I'm using a Speartech new harness and Stewart Warner electrical gauges...I have HP Tuners for it if that helps in this any.

My speedometer seems to work just fine with the car, except for one thing. When I am anywhere from ~70% throttle to full throttle, the speedometer will spin to 120-140, and stay there until I let off the throttle. I'm not too knowledgeable in wiring, so...any ideas? The Speartech harness had a speedometer-labeled wire, so it runs straight to the input on the gauge...

Thanks,
-Adam

[66LS7]

Hey guys,

I've got a '69 Camaro w/ an LS1/T56 in it. I'm using a Speartech new harness and Stewart Warner electrical gauges...I have HP Tuners for it if that helps in this any.

My speedometer seems to work just fine with the car, except for one thing. When I am anywhere from ~70% throttle to full throttle, the speedometer will spin to 120-140, and stay there until I let off the throttle. I'm not too knowledgeable in wiring, so...any ideas? The Speartech harness had a speedometer-labeled wire, so it runs straight to the input on the gauge...

Thanks,
-Adam

Does the speedo bounce at idle? You might be picking up electrical interference from somewhere. I would try putting in a 1 micro-ferrid capacitor in the signal wire, one side of the cap. to the signal wire the other side of the cap. to ground.

Thank You Randy(D&Z Customs LLC.)
1-262-347-9741

[AALynch]

Yes, I've noticed that!!! I just never cared much, because...well I was stopped and it doesn't matter LOL. When i'm accelerating, though, I need to know when to stop!

Thanks, I'll look into it.

-Adam

[dhutton]

Does the speedo bounce at idle? You might be picking up electrical interference from somewhere. I would try putting in a 1 micro-ferrid capacitor in the signal wire, one side of the cap. to the signal wire the other side of the cap. to ground.

Thank You Randy(D&Z Customs LLC.)
1-262-347-9741

1 microfarad sounds a little large. I would think it would kill the speedo drive completely.

Don