this is my tacho:



according to this website i should have 4 switches on the back, but i only have two (the small blackbox at the top of this pic):



so whats the dealio? with both the switches "off" the revs are double what they should be, and the other iterations dont seem to work either.

also, while im here, anyone know what should be connected to what on the back of my fuel gauge? i have three post connectors and two wires coming off the back

http://www.caigauge.com/page30.html

and

http://www.caigauge.com/page19.html

and even

http://www.caigauge.com/page15.html

Hope this helps.....

thank you, the second two do but i actually linked the first page in my original post.

the instructions dont work

2 wires out the back of the fuel gauge is just for the illumination.

Then you need to phone Caerbont Automotive on: 01639 732200 and ask for Ian John (top technical man).

hmmm
http://www.caigauge.com/page11.html
thats the instructions for the classic motorsport range. yours in from the motorsport range isn't it? don't know if thats different to classic motorsport

I just thought, is your engine running wasted spark?

Would this mean that it would be getting twice as many pulses every cycle, trying switching both switches on (like it would for 2 cylinder). It might make the difference.

that classic wiring is for a coil driven tacho, this one isnt.

i have set both to "on" and it didnt work at all. 1 on and 2 off gives 2x revs and 1 off and 2 on gives nothing too.

at the bottom of the page i posted there is a section about wasted spark systems

from two double ended coils, which drives the tacho directly

never said i understood it lol. nah, just wondered, because it said motorsport range, if it was more relevant to your tacho

The above linked instructions arnt for your tacho, i had the same and couldnt find the 3rd or 4th switches after looking on the net i think i found the real instructions which means yours is most likely the more modern one. This one is programmed with 2 switches which you add into the loom off the back of the tacho. i think there are 3 wires, all of which connect to earth to make the contact and 1 switch is the recall feature, mode feature and enter setting feature. in other words i have 3 switches on my dash to program it with.

if only i could find those instructions i could help more

[Edited on 1/2/10 by Moorron]

http://www.caigauge.com/page10.html

look at the loom and see if you have the same wires. if you have then all you need is a few switches to get it up and running (or just earth the wires to set it up)

* please check its the earth first *

I would phone Ian John rather bridging wires as that could end up being expensive........

yes i will phone ian tomorrow, but thanks for giving me that info!