DM Speedcal Problems

[CdnNavybob]

Just got my 4.10s and the Speedcal installed. While launching and braking, the speedo goes a bit nuts, the needle fluctuates all over the place, as high as 180kph. I'm also not sure how accurate it is, I haven' gotten the chance to really check it on the street yet, I only drove the car for 20 mins or so after getting it back.

Do you think the speedcal itself is bad or is it installed/set up wrong?

 

[xseler8]

Recheck your installation & dip switch settings. You might want to disconnect the battery if you reset anything...Check the instructions

 

[normster6969]

Go to Dallas Mustang's website and look for the support forum. Willie Norman is the guy who developed the speedcal and is very active on their support forum. He's awesome when it comes to customer service!

My speedcal would jump like crazy when moving under 10 MPH. After 10 MPH, the speedo would function normally. If you have the same issue, you may have an older Speedcal with the defective chip. Willie sent me a new unit and asked that I send my old unit back. I only had to cover the return shipping cost. Considering it took less than a week to get a response and new unit, I'll gladly eat the $4 for USPS priority... Everything works great now.

Good luck,

Norm