Just completed a full resto on my 1981 Berlinetta (original owner). I swapped out the 305 for a new Performace GM 350 crate motor. My tach worked with the 305, when I removed the 305, the computer command control was removed. Does the tach rely on this? We wired the computer back up as best we could, but the new engine doesn't have any computer connections on the block, exhaust or intake. The wiring to the distributor is good. I do have a tach from a 79 Z28(non computer command control car) I was think of trying, any ideas?