hello my name faisal and im having difficulties to source a MAF conversion for the car

its a 1984 bmw e23 maf conversion ( turbo version )
thing is the update price for the bosch AFM meter goes for 640 dollars in the dealership its cheaper outside my country but still the shippment cost will cost me even more to obtain it.....

so if im going to spend that much might as well upgrade to somthing better

PLEAse help