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Rev Counter Not Working


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#1 sam138

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Posted 04 January 2020 - 08:46 PM

Just wondering if someone could help I have wired up my Yazaki tacho
today and went for a drive however It doesn’t get much past 2k revs on the gauge when I know it’s more like 4K.

I’ve attached some pictures showing the wires linked up as follows.

Black - to earth
Blue - joined in from dizzy to - of coil wiring
Yellow - other side of coil (+)
There is a small piece of red wire on the back of tacho joining two connections together.


Am I missing something here ? Attached File  C4E42DBB-969D-4E25-AC07-13E137DB8C57.jpeg   117.34K   0 downloadsAttached File  837FBCE2-3D3D-4526-9889-C859C89727D1.jpeg   110.84K   1 downloadsAttached File  15684B32-0AA8-493B-A8F8-42F94933E906.jpeg   126.98K   2 downloadsAttached File  7280F2C2-F9DD-407B-B3B5-885313916032.jpeg   141.25K   1 downloads

Edited by sam138, 04 January 2020 - 08:48 PM.


#2 timmy850

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Posted 05 January 2020 - 05:24 AM

Does it have a switch to change the number of cylinders? 



#3 sonscar

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Posted 05 January 2020 - 09:49 AM

I would try the yellow positive to a different switched live than the coil.Steve..

#4 Twincam

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Posted 05 January 2020 - 10:23 AM

I would try the yellow positive to a different switched live than the coil.Steve..

As above, pull the 12V + from a switched live from the fuse box/similar.

The images online for the Yazaki rev counters does show the live being taken from the positive side of the coil however I have found previously that it has given me incorrect readings.

If there is a switch at the back of the unit (might be a screw etc), you may have selected the wrong amount of cylinders - worth checking to be sure.

Edited by Twincam, 05 January 2020 - 10:26 AM.


#5 MrBounce

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Posted 05 January 2020 - 11:43 AM

 

I would try the yellow positive to a different switched live than the coil.Steve..

As above, pull the 12V + from a switched live from the fuse box/similar.

The images online for the Yazaki rev counters does show the live being taken from the positive side of the coil however I have found previously that it has given me incorrect readings.

If there is a switch at the back of the unit (might be a screw etc), you may have selected the wrong amount of cylinders - worth checking to be sure.

 

^^^ What he said. My old Mayfair had a TIM rev counter and you could switch it between 4, 6 and 8 cylinders. When switched to the 6 or 8 settings it would under-read, just like yours.



#6 sam138

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Posted 08 January 2020 - 07:11 PM

Thanks for the reply’s I’ll give this a go.




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