[Rick162]

We want to assure all customers that we are here to help and make sure our gauges perform as they are supposed to.

We found that some cars have more EMI (Electro Magnetic Interference) noise than others. When we heard of the problem we immediately went to work looking for the cause.

We have been unable to replicate the condition that you speak of. To date all known issues with the speedometer have been with a mechanical to electrical converter. We know of no problems when using a transmission that has a built in electrical speedometer output.

To narrow things down let us know please let us know which ignition system, transmission and alternator systems your cars have.

Our later speedometers have a purple wire loop coming at of the back of the speedometer. By cutting the purple loop more noise suppression is added to the front end of the speedometer. This should eliminate any erratic speedometer movement while the car is stopped. Do not cut this wire if you do not have a problem.

If your speedometer does not have a purple wire loop extending out of the back and you are experiencing an erratic speedo while stopped, you can try to cancel some of the excess noise by adding a 200K ohm, 1 watt resistor inline with the signal wire. Once you've done this it should solve the problem. If this sounds to daunting you can send in your speedometer and we will update the speedometer to the newer noise suppression board.