My 1990 turbo grand prix has check gauges light on and all gauges are pegged. whats the fix?

Question edited for clarity.
Question moved to sub category.

It appears to be a known issue.

https://www.google.com/search?q=1990+Chevy+Camaro+RS+3.1+tachometer+is+stuck+in+maxed+out+position

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When you try and start your truck without a jump, what are the battery voltage shown on the gauge, there are times when the battery are just in too bad of a shape that even a jump wont help. Without the jumper cables monitor voltage indicator, it should not fall below 10 volts.

Good luck

Rodney

If your battery gauge went to zero whilst driving it sounds like your alternator stopped charging. Either the alternator itself failed or you chewed a fan belt. If you jump started it, and the battery light stays on or the gauge still reads zero then that would confirm the above.
Driving or running the car without alternator charge will simply run the battery to zero. it will be quite hard to even jump start after that.
Check for broken,lost belt and get it running again and watch the gauge/batt light. If its on, its not charging, if its off then you most likely have a battery going bad.

my oil pressure gage pegs out to the max mainly on incline or accleration, i can bring back down to zero once i shut off the engine and bump the ignition repeatdely to pull back down to zero reset.

electical is hard to diagnose with out being there. i would treat each problem seperately. first you will need to test the engine temp gauge sending unit. in a dealership this is easy with a scanner they can run a sweep test to se if the gauges are responding.you don't want the engine to over heat if the gauge is not working. next problem the dome light should be easy to fixe does the dome light work with the dome switch?remove the bulb and with the doors open and switch on check for voltage, if voltage check connection and or replace bulb. if no voltage check fuses for voltage.last will need to have the dtc po243 checked out by a repair shop. i hope this will help.

You need to get a gauge hooked up to see what the actual pressure is. (a garage can do this if you can't get ahold of one.) This will tell you exactly what the oil pump is, or isn't doing. The gauge threads in where the sending unit goes.

yes. but check every thing else first. coolant level being the most important. then the thermostat.

My van did the same thing. Actually the gauge had spun all the way around to the back side of the little peg that the needle rest on. To fix it I took the face of the dach board apart with a screw driver and rotated the needle by hand back to zero and its worked fine ever since..

sometimes when the battery is too low the gages will go haywire.check you battery terminals for good conductivity and current levels. sounds like a low current problem.computer runs on 12 volts not 11 or 10. low current will give poor performance and bad electrical response.
try that first then look for shorts under the dash ie naked wires or burnt wires.
good luck.

ok let me help you get started
this isnt going to be easy we need to do a bunch of testing.
you will need a 12 volt test light.
remove the negitive battery cable and connect one side of your test light to the battery negitive and the other side to the battery cable . and with the key off.. so now if you have a short some where the light should be lit. now what we have to do is start to pull fuses untill the light goes out. and when you find the fuse that is causing your short and drain your battery . then we have to look into the section of the wiring and components.
let me know what you find
later paul