VDO tacho wiring

[Billzilla]

We're trying to get the VDO 10,000rpm tacho working on the racing car, and it doesn't seem to want to make the needle move at all no matter where I put the wires from it.
None of the DIP swtiches and wiring has been moved from when it was taken from the old wiring loom, so dunno what's going on here.
Has anyone got a wiring diagram for one?

If need be I'll get a new 8,000rpm one (that's all we're allowed to use) or even take it out all together but I'd like to try to get it working if possible.

[oldcorollas]

checked the signal and power and ground on the wires?

LOL, first hit on google
http://www.egauges.com/pdf/vdo/0-515-012-020.pdf

and for one with hour meter http://usa.vdo.com/NR/rdonlyres/09F0...eHourMeter.pdf

and again http://www.springfieldstreetrod.com/...ctionsTach.htm


edit: oh.. you lost a wire?

[Billzilla]

Ta mate, found that on PF a while ago.

[oldcorollas]

would have found it on google faster heh heh

[Grega]

bill its not expecting a + pulse instead of a - pulse of ignition?

[Billzilla]

Dunno. I haven't got to re-wiring it yet though. I reckon the +12v thingy will make it work.

[Grega]

i got dudded on a navara a while back with a holden V6 - mate couldn't get it to work until he got the right tacho - was a VDO one with a positive pulse.

[Billzilla]

It's worked in the car before, with all the exact same bits in it - Just a new loom.

[jono]

i've got a diagram which came with my VDO tacho, i'll just have to find it later (its in my baby's room and he is asleep)