Still looking for ECU 1983 280zx part number A11 652 805
Any ideas where I can find one?

 

You can use any 1982 or any 1983 ECU. Turbo ECU's dont work in in NA cars. Here is a list of ECU. You can see that all 1982 ECU's are the same. 1983 ECU's do have different part numbers but the ECU doesn't know if you have a manual or auto trans or if the car is a cali or fed car. ALL 1982 and 1983 ECU's will work in your car