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how to fit a rev counter to a cento without one
Published by custard
12-04-2007
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okay so basic info

first thing you need to remember is a standard 4 cylinder rev counter(tachometer) wont function on the centos if you connect by the standard method.
that is taking a feed from the coil signal wire.

the reason for this is the cento uses 2 coils.so using a feed from 1 coil would give a reading of only 50% of the actual RPM

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Old 18-07-2007   #1
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Wink Re: how to fit a rev counter to a cento without one

if ya fitting to a 1.1 siecento 02 reg theres a cut out in the center off the dash then just bolt and connect ya tacho and away ya go
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Old 27-07-2007   #2
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Re: how to fit a rev counter to a cento without one

Do you mean that a 2002 1.1 has all the wiring and plug done? I can see that plug on my dash, so you're saying the only thing I need to do is to actually plug the rev counter there and it works straight away??
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Old 21-10-2007   #3
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Re: how to fit a rev counter to a cento without one

Quote Originally Posted by cojones View Post
Do you mean that a 2002 1.1 has all the wiring and plug done? I can see that plug on my dash, so you're saying the only thing I need to do is to actually plug the rev counter there and it works straight away??
I would also like to know this is the case..
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Old 25-01-2008   #4
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Re: how to fit a rev counter to a cento without one

Hello,
I am from Greece.I have a cinq 900c young 1997.
1st questiono i have to cut the black and purple cable(isn;t this dangerous?)
2st question:Which type of cable did you use? (the red cable in the photos i mean)
Thank you.
P.S Very nice work.Finally i understood how it is done.
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Old 30-04-2008   #5
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Re: how to fit a rev counter to a cento without one

You mention about swapping the speedo unit itself over so as to keep the speed reading correct. As I understand it, Fiat use the same speedo drive for the 899cc and the 1100cc cars, so would this not self-correct?

Also, I can see no way of swapping the actual units over properly as the unit in mine appears to actually be larger than the rev-counter ones.

Mine is an L-reg base model if it helps.
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Old 26-06-2008   #6
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Question Re: how to fit a rev counter to a cento without one

i've got a sei from 2006 and at the garage they say that my sei isn't prepare for a rev counter, so no wires and no signale out of the ecu. but where can i connect my rmp signal for testing? (colours, wires?)
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Last edited by dendjoker; 26-06-2008 at 12:07.
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Old 13-02-2010   #7
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Re: how to fit a rev counter to a cento without one

excellent guide, just fitted one to my 899, big Thanks!
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Old 27-09-2011   #8
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Re: how to fit a rev counter to a cento without one

help ive just fitted it as per the guide to my 899 sei but not working ive found the purple /black wire spliced into it and attached to the light blue on the signal wire to the rev counter red and black on to live and black onto negative but no joys have i done somthing wrong or have i bought a caput rev counter?? cheers Lee
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Old 06-01-2013   #9
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Re: how to fit a rev counter to a cento without one

Quote Originally Posted by custard View Post
for a sei the wiring colours are:

Red and black - Connect to an ignition live
Black - Connect to a good earth
Yellow and red - Connect to speedo illumination live
Light blue - Connect to the black/violet speed sensor wire from pin 23 from ecu from the fuel pump relay.
According to Seicento Technical Service Manual (E4020, page 2) Red and Black Wire is signal and Light Blue is Ignition Live.

Maybe the guide needs to be corrected.
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Old 19-01-2013   #10
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Re: how to fit a rev counter to a cento without one

Hiya. I'm looking to put a Sporting tacho in my 899, and I'm a bit of a novice with electrics and I don't really know anyone who knows much either... So I just want to know where do I find the wire to get it to illuminate and where do I source the wire for the ingnition live. Thanks!!
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Old 18-04-2013   #11
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Re: how to fit a rev counter to a cento without one

just wondering if anyone SUCCESFULLY drilled factory rev counter to nonsporting dash without one-will it fit in any way, and is it possible to connect?? (sei brush 2001 nonsporting).

will those small cheap universal gauges from ebay worked with connecting to pin 23 or theres other way of connecting?

Thanks
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Last edited by Diwiak; 18-04-2013 at 21:00.
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Old 31-05-2015   #12
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Re: how to fit a rev counter to a cento without one

I have just completed this mod (thanks to the above) and would like to add a postscript. The Fiat key code lamp is sacrificed when adding the rev counter so I worked out how to retain this function. Below is the connector wiring for the printed circuit board (pcb) behind the gauges. Only 3 differences in the connector wiring (highlighted in grey). I used the pin numbering and alphabetic connector designation used in the Haynes manual. The circuit diagram in the manual is the early Cinq (with choke).



The changes I made to the above are as follows:
1. Instead of soldering the rev counter feed wire (from pin 23 of the ECU) to the pcb, cut the blue/black wire that goes to pin 3 on connector C leaving a few centimeters on the connector. Then connect the rev counter feed wire to this short length of wire.
2. The other lose end of the blue/black wire (Fiat key code) needs to be connected to the Fiat key code indicator lamp on the rev counter pcb by soldering a wire (white in this example) to the copper area as shown below. This wire is connected to the blue/black wire in the loom using a bullet or spade connector.



The earth for the Fiat key code lamp needs to go to pin 2 of connector C. To do this, the copper area around the Fiat key code lamp on the pcb has to be isolated as shown below. VERY CAREFULLY scratch the copper from the flexible green substrate with a sharp knife. Be extremely careful not to cut through this material. Check (with a continuity tester or ohm meter) that the copper is isolated from the earth connection around it. Leave enough free copper to make a solder joint - outside the area occupied by the bulb holder.



Solder a wire (black in this example) to the freshly isolated copper area and solder the other end to the unused lamp position that leads to pin 2 on connector C. Ensure that solder does not bridge the isolated area - check with the continuity tester again. This forms the earth connection for the Fiat key code. Note that the white bulb holder is a dummy as this indicator position is not used:



The photo below shows where the blue/black wire is cut and how the rev counter feed connection from pin 23 on the ECU (purple in this example) is made. I picked up the connection from the purple/black wire on the Fuel pump relay (as in the guide above).



I also replaced the Sporting's 180 km/h speedo with my 160km/h speedo from my original gauge set. Simple one-to-one swap. And don't forget to check all the lamps - two were blown on mine - as it's much easier to change them now!



Maybe a lot of work for a lamp that flashes on for a fraction a second when you start the car, but I wanted the conversion to be complete.



Note that wire colours might vary and only try this if you are confident with fine soldering. Too much heat may lift the copper from the green substrate or melt the plastic case behind. I cannot accept responsibility if it goes wrong!
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Last edited by car2oonz; 31-05-2015 at 21:58.
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Old 01-06-2015   #13
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Re: how to fit a rev counter to a cento without one

Did you do anything to get your temp gauge to work?
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Old 16-06-2015   #14
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Re: how to fit a rev counter to a cento without one

Quote Originally Posted by Lococheech View Post
Did you do anything to get your temp gauge to work?
My original dash was the one with a temp gauge, and the gauge on the Sporting dash worked with no problem. Some later Cinqs don't have a temp gauge, so they also don't have the sender. They just have a switch that turns the temp warning lamp on when it gets too hot. So you will need the sender - fits in the same threaded hole I think.
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