txturbogs

So my tach took a dump and I cant read RPM. I was reading the RPM from the turbo timer which is installed behind the steering wheel, but I changed the ECU to a Pettit Racing Unlimted, and I can't figure how the hell to make it work again. No instruction manual from the Turbo Timer either, its a Greddy.

Can any point me in the right direction or help me? Thanks