Riviera digital Instrument cluster (IC) into a Fiero dash (Page 1/11)
Cajun JUL 27, 11:28 AM
As the topic states, I'm in the process of installing a 92 Buick Riviera digital instrument cluster into my 86 GT dash. I have already made the necessary modifications to the Fiero IC surround to facilitate the mating of the Riviera IC into the Fiero IC surround.

Before I can install the new Riviera/Fiero instrument cluster I need to remove my entire dash. Normally for the Fiero IC removal the removing of the dash is not required. But in my case it is as I need to make room for the new "Fiero BCM" module. To accomplish this it will require me removing the 2001 HUD circuit board that I have installed under the dash on the driver sider under the speaker. The new Fiero BCM will occupy this space.

The attached photo is what the setup will look like. Bear in mind the final Lexan face plate is not yet installed. My plan is to post additional information and photos of the install, to include surround modifications and the necessary wiring modifications.

None of this would be possible without the hard work and development of the Fiero BCM hardware and software by Chris Eddy. The BCM allows the Fiero to communicate to the Riviera digital Instrument cluster.

hercimer01 JUL 27, 01:11 PM
oooooohh!

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Project Genisis Lo Budget 3800SC swap
12.840@104.8 MPH Intense-Racing 1.9 rockers, 3" exhaust, 3.4 pulley, ZZP tune and 18 year old tires.

88 Coupe under construction SOLD

88 formula 3.4L 4t60 swap SOLD

88GT resurrection in progress.

andreww JUL 30, 10:35 AM
Cool project. Personally I prefer real analog gauges, but I do love the more modern look of digital.
Cajun JUL 30, 03:28 PM
I have removed the dash, the HUD unit and associated circuit board. Now I have to clean up this rat nest to make room for the Fiero BCM. I am currently fabricating the necessary wiring harnesses for the transition to the digital instrument cluster.

I have already did the needed modifications to the Fiero IC surround to accept the Riviera digital IC. I am currently editing the photos so all can make sense of what I have done. Once complete I will post the photos.

Below are photos of the dash removed and the "rat nest" of wires that needs to be sorted out.






Will JUL 31, 01:16 AM

quote
Originally posted by Cajun:

None of this would be possible without the hard work and development of the Fiero BCM hardware and software by Chris Eddy. The BCM allows the Fiero to communicate to the Riviera digital Instrument cluster.

]http://images.fieroforum.co...surround.jpg



Do you have more info on the BCM development?

[This message has been edited by Will (edited 07-31-2020).]

ChanningB JUL 31, 10:34 AM
Cant wait to see the finished product!!! I really like that cluster!
Raydar JUL 31, 08:30 PM

quote
Originally posted by Cajun:
...
The attached photo is what the setup will look like.




Now that is damned sexy!
Is the new BCM also sourced from the Riviera?

I am guessing you are running an OBD2 PCM, in order for the BCM to not be lonely. Correct? Or is the BCM going to be stand-alone?
(Sorry... I am not familiar with other things you have done to your car. I don't get here much, lately.)
Chris Eddy JUL 31, 09:39 PM
The BCM is new, it is a design that I did specific to mate the Fiero with the Riviera IC.
It takes all of the discrete wiring, and processes the signals through a microcontroller, and then digitizes the data onto the IC.
The analog inputs are all current sources.
The digital inputs are either connect to ground or connect to 12V to activate.
The speedometer has a divide by 2 so that (doing this from memory) 4000 PPM becomes 2000 PPM for the ECU.
Speedometer and tachometer inputs are digitized in software, and delivered to the IC.
When you pull out the Fiero IC, we loose the odometer. So the board has a little bit of memory and it keeps the odometer.
The trip odo does not work, or specifically the reset button, as I could not work out how that bit of data comes back on the serial line.
To set the odometer, there are buttons.. select digit, set up set down, and so forth. The last setting is the tach scale.. 4, 6, or 8 cyl.
The board has a serial input to take in the Fiero ECM signal, but no software for that yet.
The board also has a CAN port to make an OBDII port, but no software for that either.
I designed the PC board, so I have to make them by hand when I build. I have two right now, one with Mike and one with me.
When it is all sorted out, we will be sure to share the joy.
Cajun AUG 02, 04:08 PM
Below are a couple, three photos of the Fiero IC (instrument cluster) surround structure and what will need to be removed in order to accept the Riviera digital IC.




The red section in the next photo is what areas need to be removed.


The next sevreal photos of what the surround looks like with material removed. Note: a bracket will need to be frabricated to support the surround structure.








The next photo is of the bracket that will need to be fabricated.


I know this may be all too confusing. It took me a while to wrap my heard around what I needed to do and what needed to be removed. It was pretty much trial and error. A little bit of material removed here and there. Test fit, remove more material, test fit again unit it all came together.

Please feel free to ask questions.
Raydar AUG 03, 02:27 PM

quote
Originally posted by Chris Eddy:

The BCM is new, it is a design that I did specific to mate the Fiero with the Riviera IC.
It takes all of the discrete wiring, and processes the signals through a microcontroller, and then digitizes the data onto the IC.
....
When it is all sorted out, we will be sure to share the joy.



Wow! Impressive. Good show!
I'll be watching.