Converted 74 Duster to auomatic on the floor, and now won't start. HELP!!?

d1970 said

check the connection on your neutral safety switch on the Transmission, you might have it on backwards!

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You can't put the connector on backwards. Or to put it another way, if you put it on backwards, it would still work. The NSS is the center pin, the backup lamps are the two outer pins.