What is causing a ticking sound in my 96 mondeo estate?

I have a 96 mondeo estate and there is a ticking sound coming from the dashboard, its not as loud as the indicator ticking but annoying non the less. It starts and stops all the time, there are no visible warning lights on so i need help! Im pretty sure its nothing to do with the indicators as when i put them on i can hear the indicator tick tock as well as the other ticking, its starting to drive me mad!