Affordable way to centre mount Speedo?

I have to centre mount the Speedo for rwc. I had a look and if my eyes do not deceive me the instrument clusters company's want 300-500 bucks for them. Surely freakin not?!

I have to centre mount the Speedo for rwc. I had a look and if my eyes do not deceive me the instrument clusters company's want 300-500 bucks for them. Surely freakin not?!