Auto Electrician Job - Brits, NW, 0250

My Mercedes Benz A160 modified to manual gearbox had an engine replacement recently. The car electronics not working properly since and the workshop does not have an auto electrician. Speedometer and rev counter works intermittently, radio keeps switching on and off, warning lights on the instrument cluster keeps switching all on then a few off, aircon won't switch on. When the speedometer is working, so does the automatic central locking but automatic central locking stops when speedometer stops.