Tachometer Not Working - Ideas To Fix, Plse!

[mmatthej1 1]

The tacho shows no sign of life, unfortunately - all I've thought to do (so far) is check fuses, which seem ok.

 

Can anyone suggest things to check, please?

 

(instrument panel is out of car at present, btw)

[jackherer 543]

Check the wiring on the coil is all OK.

[mmatthej1 1]

Ah, sorry, I should have said that it's a turbo-diesel...............

[jackherer 543]

I think they have a crank sensor to drive the tacho but I don't know any more than that.

[welshpug 1,657]

yep, check the wiring to the sensor then adjust the sensor, IIRC should be a 1mm air gap from the flywheel.

[mmatthej1 1]

Good tips - will check that out, thanks!

[Anthony 1,003]

I'm not sure that a TD pickup will drive a petrol tacho will it, which that one pictured clearly is?

 

Certainly tacho's that are driven by the coil will have filtering circuits on them to deal with the spikes and I would imagine at a minimum that filtering circuit would need to be removed/bypassed/reduced in the same way you need to in order to get them to work on a ECU driven tacho output as used by most modern ECU's.

[mmatthej1 1]

Whoa - you reckon the instruments are from a PETROL model?

 

Surely not - there is a (working) glow plug warning light in the set, so that rather says thet these are the original set for the TD model??

[S@m 156]

The rev limiter is 6K so i;d imagine they were from a petrol . All models have the glow plug light,even gtis.

 

See here for diesel gauge wiring help; http://205d.free.fr/compteur.htm

Edited April 29, 2015 by S@m

[Anthony 1,003]

The TD rev counter only reads to 6k rpm and even the petrol clocks have a glowplug warning light present (but no bulb fitted)

 

[welshpug 1,657]

yeah, that looks like a set of XS clocks.

[mmatthej1 1]

Oh, that is most interesting - maybe a previous owner stuck a (petrol) replacement instrument set in, for whatever reason - from earlier comments by Anthony, it would seem that tacho in diesel has different attributes, so perhaps this petrol tacho could never work in this TD car !?!

[mmatthej1 1]

Ha - I've now compared the instrument set with my sons STDT set and - spot on chaps - my set is clearly not the same, with 6K redline vs. 5K on the STDT !

 

How did I never notice? - doh!!

 

Now I need a set of instruments for a TD - anyone got a spare set??