1972 th400 speedo error, help?

[tim21391]

Been awhile since I been on here but you always help so if anyone has input that would be great... I have a 72 c10 with 402 engine and a turbo 400 trans... Speedo used to work then the speedo gear housing broke so I ziptied it up to get it to work now it don't work again and I think I may of last some gizmos and gadgets.. Tires are 31x10.50r15 I believe.. And gear ratio is 3:08. I know that's how you change speedo but here's a pic of what I have its off google but I would need the housing, the driven and drive gear and all
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