Ok so I originally had the old 85mph gauge in my car and was looking to swap it over to the 145mph gauge with the rpm gauge and the needles rather than lights for the oil, battery, and temperature. I am unsure whether or not I can just plug this new one in or not. Today I removed my old cluster and put in the 145 mph gauge but for some reason, when I turned my key the fuel gauge as well as the temp gauge and a couple others didn't move at all. Do I have to convert something? Did I get a bad cluster? Also one of the blinker lights doesn't turn off, even when my lights are off. Thanks in advance!

So what kind of car do you have?

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Sorry lol. 1987 Camaro v6 (will be v8 soon)

You may have to. I have an 85 and converted to the 145mph cluster from a later 80's car. I had to rearrange some of the pins on those two connectors behind the cluster. You need to get the wiring diagram for your car and the one the gauges came from to figure it out.

Sounds like original dummy lights. If so, the following should put you on the right track:

https://www.thirdgen.org/gauges/

JamesC

thanks guys!! ill check out the wiring

FYI: Not all gauge clusters are the same. The 'plug & play" compatibility range is 82-85 and then 86 to 89.

From the link James posted for you :

John, what is required to do to install the 86-89 gauges into a pre 86?
I was planning to get rid of the 85 mph setup.
Thanks

*edit* I found one of your posts mentioning a backlight and brake light need to be reconfigured.

Yup, That's the problem.

The BRAKE warning light was moved from the far Right to the far left of the cluster. if an 86+ cluster is used in a 85 and earlier car then this change will cause 1 or 2 of the backlights to become non-functional as well as the BRAKE warning light.

All other functions should work normally.

I'm not sure re-pinning the cluster will resolve this problem or not. The simplest way to overcome it ( IMO ) is to use a 82-84 gauge cluster and install the 86+ 145 Speed head into it. The 82-85 cluster ( more accurately - it's printed circuit ) will be a direct match for the 82-85 dash wiring.

That would work but the trip meter reset is in a different location.

I figured that you swapped full clusters already because the other gauges ( not speed ) started giving you trouble. During a direct idiot light-to-gauges cluster swap the fuel and tach should work fine,... but the temp and OP gauges need new sending units before they will work properly

What you say is true; again, I thought you already had a full 86+ cluster. So,....... to be more accurate; Just swap the Speedo head and matching clear lens into an earlier 82-85 (GAUGES) cluster to avoid compatibility problem.