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You should be able to call the 1877-334-8355 and get a tech person during normal business hours. There are about 20 or so guys in that division.
But anyways, if you hooked the tach input wire of the ECU directly to the TACH output of an HEI or DUI version of distributor, you most likely damaged that circuit. It will only take 1 ignition pulse to do it as that voltage is very high (100 volts) compared to the 5 volt signal it is expecting. This is what the TACH Adaptor was designed for to convert that signal down and isolate the ECU from the noise.
What you can try is just turn everything on and go the the LIVE DATA screens of the handheld and look at RPM. When you crank the engine it should show a few hundred, if not, there is no RPM or TACH signal getting to the ECU. If you need to send it in for repair, call the number above, explaing what happend, and get an RMA number.
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