Ignition switch and wire harness for ignition switch. My husband did both. I was losing dash gauges intermittently and overdrive. Now that is fixed and six months later looks like I need the multi function switch(turn signal, wipers, cruise lever). My husband has to take that all apart again for this problem. My turn signal blinker noise won't shut off. Driving me crazy.
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Is it only the gauges or the all the instruments and heater controls? The first place I'd look at will be the dimmer switch. Normally the instrument lighting shares the same circuit as the parking/valet lights.
That is normal, many vehicle normal pressure is 50 psi and minimum is 15. The pressure you have is good,Its high but good,some high oil pressure will cause the lifter to solidify and then a misfire will occur, and again this is very rare.many oil pump in yester year car was driven by a worm gear attatch to a distributor, and it is still but without the distributor. So the oil pump is driven the same way and is monitored by the oil pressure sensor,(when oil pressure is low the light will go off then you would know you got a problem). The faster the car is driven the more lubrication its going to need so the oil is buid up at the same time engine demands are high. You dont have anything to worry about enjoy the car come on its a Corvette. Just make sure the level is good and change when its needed.
Some cars came with this light to help the driver know when to shift to the next gear. IE: 1st, 2nd, 3rd and so on. It will not indicate when to downshift to a lower gear. It's main function was for optimal mileage and proper RPM shifting. Happy driving.
take a look at the dash ground wire located next to the right of ebrake release handle. if the bole holding the ground wire is loose, which was quite common it will cause all kinds of feed back problems, like described in the comments section to your question.
The speedometer Gear drive may be going bad. Or it could be if your speedometer is cable driven the cable just needs lubed. On the side of your transmission near the rear you will see a small gear box with wires or a cable. Place a pan under it and remove it from trans. Check gear to see if it is chewed or worn. If not and you have a cable driven speedometer use graphite cable lube on cable. If this don't work it could be in the cruise control or speedometer.
Check the fluid level first,either too low a level or too high a level can cause erratic shifting and also if the oil smells as if its burnt there could be internal damage to clutches and brake bands.The fluid would be the first thing to chech anyway with the car driven and warmed up first and then check the oil level in neutral while car is idling.
If grounding the dash does not work, try putting a mechanical gauge on it and reading actual oil pressure. Pressure does change while driving, but should not wander. With mechanical gauge, check that running hot at idle (in gear if automatic) pressure should not drop lower than 15psi (I'd rather see 20) High reading should be around 40 -50 but no higher.Low pressure indicates a loss of supply or bad bearing on the crankshaft, high pressure may be caused by sticking pressure relief or restriction in an oil passage.