How to get VDO tach working with Redline VW EFI?

[63Fiberbuggy]

I have a 2 1/6” VDO Cockpit series tachometer that worked fine with my MSD 6AL ignition; however, when I connected tach to the newly installed Redline EFI, I get “no indication”. As I understand it, the green wire w/white stripe from Redline ECU provides a standard “high side” output for input to tachometer, and that’s how I have it wired.

I read the VDO literature and can’t find guidance for ECU inputs; but I did find information about 3 DIP switches on the tach and tried all combinations but still don’t get an indication.

Anyone have this setup and can provide troubleshooting advice?
Thanks

[KEGZ]

Call Ruben at Powerhaus or Kris at Paradise. They install and tune the Redline system all the time..

[nogoodwithusernames]

You may need to get something like this.

https://www.pelicanparts.com/More_Info/PELTAV3.htm...BKEALw_wcB

I made my own version to use the ISP West T3 tach with the MS-EFI system I'm running, but I can't remember where I got the diagram/component list from. Maybe a quick web search would pull it up for you. It was a fairly simple circuit since I didn't need to change # of cylinders, just to give the proper voltage spike for the older "style" tach.
_________________
71 Squareback, 1.7l T4 w/ crank trigger fuel and spark
(Conversion thread https://www.thesamba.com/vw/forum/viewtopic.php?t=732508&highlight= or https://shoptalkforums.com/viewtopic.php?f=1&t=151375&sid=f0542d44a322d290c29d6609fac7f215 )
74 914, 2.0L w/ D-Jet

-Derek

[63Fiberbuggy]

thanks guys!