Tom Bradley
| Joined: | 07-15-2013 |
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| Posts: | 200 |
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Oops. Looking more carefully, you may have the new tach wired up incorrectly. The old one was current sensing, the new one is voltage sensing. So the +12V should go directly to the +V of the tach and to the +V of the coil. Then an additional wire should go from the other connection on the coil to the sensing input of the tach. Is this what you did? If not, there may be too much resistance in the circuit going to the coil. In that case, you might get a spark, but it would be too weak to get the engine to run.
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