67 tach send out? Or can i fix?

Dana67Dart said

If resisters fry try going with a higher wattage resister. e.g. if that are 1/4 watt use 1/2watt

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Actually, to be exact, I was responsible for frying the resistors both times. I was bumping the engine over at the solenoid and "spiked " the electronics in the car. The circuit board was designed with 1/4 watt resistors so thats what I replaced them with.
Now that I know what happened, I have an inline plug with the Tach wiring that I can unplug when I'm working on the car if I wish. Problem solved. No issues with the Tach since.