Speedo glitch???

[brooksy]

I'm having problems with what I think is the speedo glitching. When I turn the radio on and then the car everything is fine,but as soon as I put the car on the track it shoots off like a missile!!!.
I've had a look at everything I can think off,ie the radio settings,I've reset the speedo and I've tried a power cap too but nothing seems to work.

I don't think it's the radio because I've used it to run my other car with different speedo and motor in and it was fine.

I'm running an Absima CTS10 speedo with an LRP 7.5 x20. I've had no trouble with it until last weekend.

Anybody got any ideas???

Phill