Question with a 90-91 CV/MGM gauge cluster

[Mainemantom]

When replacing the circuit board on these vehicles, how is the panel attached or what kind of adhesive is used ? I have noticed that the circuit board seems warped and somewhat detached from the cluster.

[87gtVIC]

I know the 79 to 89 ones are not adhered but fastened by the various components that attach through the printed circuit and the plastic backing itself. There may even be a handful of plastic pegs that help grip the printed circuit assembly to it when pushed into place. Curious to hear how the 90+ cluster printed circuits were retained.

[WagonMan]

I have several gauge clusters. The circuit board is held on by two "tits" that hold it in place. There are some sort of clips where the gauges and speedo plug in. The rest of the circuit board is held on by the light sockets. WagonMan

[gadget73]

What they said, its more or less like a straw is held in a soda cup lid than any sort of real retainer. Once you take out all of the bulbs and such it will come apart. The things that look like metal U clips are what contact the gauge internally, so the guts have to come out before the foil will let go.

Just be very careful peeling it off,the plastic is now old and those copper foil traces are not super robust. They will let go from that plastic film without a whole lot of abuse.

[87GrandMarq]

Sorry to thread hijack Tom but since the subject has been brought up does anyone know if the 92-94 grand Marquis clusters are interchangeable with the 90-91’s? The cluster in my 90 has been acting up since I replaced the odometer gears.

[sly]

I think the 92 is. I think they went to the same cluster in 93 for both.

[VicCrownVic]

I'm pretty sure '90-'94 MGM cluster is interchangeable. Kodachrome Wolf, might know for sure, I think he had looked at those clusters a little more in depth.

CV went to the newer cluster in '92 but MGM did not until '95. Not sure what cluster the TC ran after '91, but '90-'91 TC cluster should also interchange with '90-'94 MGM.

[Kodachrome Wolf]

Sorry to thread hijack Tom but since the subject has been brought up does anyone know if the 92-94 grand Marquis clusters are interchangeable with the 90-91’s? The cluster in my 90 has been acting up since I replaced the odometer gears.

Physically yes, but I know some select warning lights changed places over the years, but it was typically little things that won't be of concern on a Box, like O/D Off, Air Suspension, and something else... perhaps low washer fluid? The rest of the important ones should be in the same spot.

I always noticed the '92-'94 stepper motors moved way smoother than the '90-'91 stepper motors did. I specifically swapped one of those steppers onto the 140 MPH cluster I had and it worked so much better.

[87GrandMarq]

Great info thanks guys. I’ll try to snag another cluster to swap in or pull parts from. Ever since I swapped out the anti slosh module the speedometer works for a little bit then starts to get hung up. I can accelerate and what it does is it will jump to a certain speed, stay there, then jump to another speed and so on. If I tap the cluster it will move to the actual speed until I speed up or slow down. Also both stepper motors for the odometer and trip stopped working at around the same time.

[Pvt.Hudson]

I'm pretty sure '90-'94 MGM cluster is interchangeable. Kodachrome Wolf, might know for sure, I think he had looked at those clusters a little more in depth.

CV went to the newer cluster in '92 but MGM did not until '95. Not sure what cluster the TC ran after '91, but '90-'91 TC cluster should also interchange with '90-'94 MGM.

A 90 TC will be electronic instrumentation standard on all three trims.

91-92 TC's have analog horizontal gauges (pic below) on Executive or base. Electronic on Signature/Cartier.




93 Went back to electronic instrumentation and ended in 97. 93-94 electronic instrumentation isn't interchangeable with 95-97 but they are interchangeable with a similar year CV/GM. 95-97 Electronic instrumentation can be interchanged between a CV/GM/TC BUT the TC has a different warning center so you will lose warning or gain them if you were to swap between a CV/GM & TC whereas the CV/GM uses a hybrid of the 93-94 cluster but shaped to fit a 95+ dash and remained mostly the same save slight revisions until 2005.I dunno what the interchangeability is with 98+ but a 98+ TC cluster is totally different from any CV/GM from that point forward.

[gadget73]

I believe there is also a minor color diff. Thinking 92GMQ at least were more of a dark grey vs black background? That might be a one-year thing.

[DerekTheGreat]

SpecMo in Madison Heights, MI might be worth a call too. They rebuild clusters, but expect to pay at least $200.

[Tiggie]

While we are on the topic, anyone know if the stepper motor from a 90/91 police speedometer is the same as any other? Or is it a unique part? Mine gets a little wild in cold weather.

[sly]

functionally the same as 92+ but not as clean steps as the 92+ according to rumor. Seems the 92+ steppers are smoother. (92-02 at least should be the same... when they went to the off center speedo, things may have changed).

[87GrandMarq]

Hmm maybe I should actually test the stepper motors first…