1997 LeSabre Custom: Adding Aftermarket Gauges>Where to run the wiring?

shrewz92

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1976 Skylark v-6 231-cid carburated, 1997 Buick LeSabre Custom 193,539 miles (Son's College Car)
Knowing that the car doesn't have a great engine-status information system, except for Idiot Lights, and after watching a car revival channel on YouTube (Junkyard Digs), I want to start a project.

For each of the revivals, which may have a minimally-gauged dash, the lead usually adds a set of gauges to help monitor the health of those old cars.

Since the Custom we have doesn't have a gauge cluster that shows RPM, oil pressure, volts, temp, I'd like to add those to Great White.

Which of you all have done that addition, on a LeSabre, or another car, and how did you route the wiring through the firewall? Is there an adequate, and relatively easy spot/hole/harness pathway to pass that wiring through? I couldn't see any other easily accessible location except for the hood-release hole, near the Emergency Brake foot lever, which I used when I had to wire a new horn to the car. That took HOURS to fish the wiring through that hole because of my ignorance of any other place to route through the firewall. I didn't see any readily accessible places where wiring came through to the cabin, when I did that project in August.

My desire is to NOT remove the dash to chase-down a route, and to avoid drilling through, except as a last, destructive-resort. Great White belongs to my son, is his daily driver at college. When he comes back, in a couple of weeks, I'm thinking of taking a crack at it.
 
scan gauge ii
 
@BuickGirlFromMars, I don't know where that may be under the hood, or the dash. Is that an actual gauge set that has directions on how to route through firewall?
 
@BuickGirlFromMars: Thank you for the option. Yes, that's easy, it appears and plugs into the OBDII port. I found it online. I would like to have analog gauges that would be an easy, quick-read, while driving.
 
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he edited his comment because he retracted it.

scan gauge ii is the easiest not-interupting way to do what you want. if you want, just get the factory gauge cluster with gauges. might even be digital. junkyard, ebay.
The differences in wiring MY GUESS would be sending units, but id think it would be plug and play
 
No I posted an explanation of the scan gauge 2 but it was already explained so I deleted the comment.
Not sure if you have installed gauges on a computer controlled engine but for a daily driver for your son in college are you sure you want to dive into this project.
 
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It's a 1997. Information is power. In my head, at 181,000 miles on the odo, it would be nice to see if she's creeping up in temp, or not getting enough oil pressure. I've been spoiled with cars with at least a temp gauge and tachometer, and he drove my car (not a Buick), which had those, before buying his LeSabre, in June 2020.

RE: Gauge cluster exchange: I saw a video on YouTube, in August, of a fellow who took out a Custom's gauge panel and tried to replace with a Limited panel, and found there were no wiring connections for most of the gauges. The wiring was different, between the two on the car he was trying to upgrade.

RE: ScanGauge ii: Is it a hassle taking eyes off the road and pressing those buttons to get the info, in traffic, at 65mpg, or in stop & go city driving?
 
not sure as i have DIC. similar but stock cocnept. I suspect the other gauges are run off inputs to the PCM and use class 2 wires to the cluster, no hard wiring. this is good for your case, that means you can literally plug and play the dash with gauges as the cluster will interpret those signals
 
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