I have an external speedo buffer that I need to install to get the speedo working again. I know this should be a fairly straightforward thing, but wiring always gives me problems. After the connections are made from the tranny to the buffer and power/grounds are made to the buffer, which wires in the dash harness need to be conected to the buffer? Are these the only other connections that are needed? I have a 90 Firebird that has an '89 Camaro TPI engine harness in it. The trans is a T56 so the output from that is the same, but will the cruise work too? The car was originally a 305 TBI. Thanks, Rob.