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.