Go back to basics. Check for spark at the plugs. If you have spark, then check to see if there is fuel at the carb. Open the choke and look down the carb and pull on the accelerator linkage to see if fuel sprays into the carb. If you have fuel and spark it should at least try to fire up.
If it was running when you parked it and the only thing you have done is add a tach then I would also check out the wiring for that especially where it connects to the distributor. Did you dislodge something or have you got the wires on in the right spot.
This is very basic and it has to be a simple answer.
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1968 Chevy - 292 with a powerglide
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