200TDI Tachometer Reading Ridiculously High - Defender Source
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Old June 19th, 2016, 09:28 PM
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1969 IIA
Join Date: Aug 2013
Location: The South
Posts: 560
200TDI Tachometer Reading Ridiculously High

Not sure where to put this, but I'll ask here.

I installed a Bosch Tachometer today on my 200TDI (Series IIA Conversion).

On the 4 Cylinder setting the gauge reads stupid high………over redline @ +4K.

If I move it to 8 the gauge drops, but still hovers around 2500RPM at idle. Sender is hooked up to the W post on the alternator, so I'm not sure what else to do.

Am I missing something (clearly I am)?

I have read some stuff about alternator pulley size and have tried to measure mine and think it's 65mm or pretty close +/- 5mm, it's in a spot I can't really get a decent measurement on it without trying to remove the pulley. I just can't get my hands in there.
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