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1 ohm is the number. Anything more and there is a problem. Also the td42ti has some other things happening with the small amount of electronics it has on cold start up. I doubt the rpm sensor has anything to with the noise but there is a coolant temp, injection pulse and timing control solenoid that do. But it seems like you have found the problem.
The glow plug timer should also function it a way that it powers the glow plugs in a cycle until a certain temp is reached.