2002 Mustang GT speedometer and tachometer cycle

[sheriffray]

2002 Mustang GT speedometer and tachometer cycle after engine start. I have the newest software version in the Predator. The gauges did not do this with the factory tune. Can you tell me what is wrong?
Thanks.
Gerald

[mikel]

This sounds like an issue with battery voltage. I have seen this personally in my own car. All else seemed to be okay, but a good friend of mine who is an excellent tech swore to me that my battery was dying. After much reluctance, I changed the battery and, voila, no more sweeping guages at startup.

Maybe you could try charging the battery before replacing it to see if this helps.

Thanks

[sheriffray]

Thanks for the quick response and the info. I'll give it a try and let y'all know the results.
Sincerely,
Gerald

[sheriffray]

Charging the battery did not work, but you are correct. It was the battery. The static voltage was OK, but the battery was weak when a load (starting) was on it. A new battery did the trick. No more sweeping gauges. It probably would have taken me months to figure out. Thanks!!!!!!!!!!
Gerald

[mikel]

Glad I could help!