golf gti mk1 with braun brenner conversion

hi all new to the forum and wondred if any one can help i have a mk1 gti with a braun brenner supercharger conversion and my oil buzzer is staying on also the lcd for the clock dosent work the oil pressure is fine what can i do to stop this horible noise please

Try changing the oil pressure senders or the voltage regulater on the back of the speedo (looks like a space invader) 

It's Bahn Brenner !!!