Replace the gasket.
The gauges on the dash is the instrument cluster.
the kind that convert co2 and oxides of nitrogen into other stuff...
probably 3/8"
check the voltage regulator
On a 1994 Buick LaSabre why does the engine continue to rev up while driving even when the brake is applied ? or when driving why doesn't the engine return to idle when the brake is applied? I would check for a vacuum leak
The 1994 Buick Century 4 cylinder head gasket will have to be removed and replaced. The head has to be removed, along with anything that is physically in the way of removal, before the head gasket can be removed.
Check fuse for parking/tailights Could be a bad headlight switch Could be an open in the dimmer rheostat
That is an indication that head gasket is leaking. yes!
tip top condition I'd say 26 mpg, tip top and driven well. I get maybe 25 out of my '95 LeSabre, on good days.
Can't say for sure, but I would encourage you to remove the kick panel and look under the dashboard at the far right side of the passenger's legspace.
Remove battery cables with a 5/16 wrench then take a 13mm deep socket on a 10" extension on a ratchet and remove the one lock down bolt on backside of battery.
What is the COMPRESSion for 1994 buick century