Tach wont go over 1000 rpms

[a_and_b1228]

I have just gotten done installing my VDO tach in my 79 california bus. I have working lights and the guage will not go over 1000 rpms. I also have some wiring questions, where in the fuse panel do I run the wire from my tach. Also does the different type of ignition coil needed for the california EFI make a difference.

[Randy in Maine]

The 79CA coil is no problem.

Make sure your tach wire is hooked up to the "-" or "1" side of the coil, that the little dip switches are set correctly for both electonic ignition and 4 cylinders, and that you have the Radio Shack diode #1N4005 attached to the wire going from the coil.

Been here? http://egauges.com/pdf/vdo/0-515-012-020.pdf

[Dead 1]

My tach is doing the same thing. Checked the dip switchs, have a diode in place but tach is way way off. Any helpful ideas?
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[Randy in Maine]

What happens if you remove the diode (thinking that it might be on backwards)?

It should work even though it might dance around a bit.

[TRN9]

On my VDO tach the dip switches were installed upside down, I had to rotate the tach 180 to set the dip switches properly. Might double check the dip switches.