eletric fault

man came out and replaced a sensor and checked oil presure on the first day second day still same problem the light just goes crazy flashing like a christmas tree so said it is probaly eletric fault and they need to book it in for a diagnostic problem is getting relly bad now with all flashing lights going crazy not booked in to wekend hire company and boss said it will be ok to drive just make sure you check oil daily just hope it dosent catch fire the way its going