That sounds like its not a oil level gauge at all. it sounds like a oil psi indicator. when you accelerate your oil psi increases. same when the engine is cold. this is a normal thing that trucks and every vehicle for that matter do. my truck has a oil psi indicator and it does exactly what yours does.
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02 sensors will not cause your vehicle to stall if they are bad enough to stall vehicle then your check engine light would be on. if the oil level only reads when vehicle running then ADD OIL ASAP. the level is very low. your dipstick checks level in pan once all oil drains back to pan with vehicle off. your oil is constantly flowing when vehicle running. that flow is splashing the oil up high enough that you are seeing it then. once truck is off all the oil drains down to pan and means level is so low not hitting the dipstick. If no reading when truck off you may need atleast 2 quarts of oil. Start by adding one quart to see if you get a reading. keep adding until you do. do not check immediately after shutting vehicle off. you have to give the oil time to drain back down to the pan. DO NOT KEEP DRIVING THE VEHICLE THAT LOW ON OIL YOU WILL BLOW YOUR ENGINE.
Verify that the engine has the proper amount of oil. The inertia from accelerating may be moving the oil in the oil pan away from the sensor and causing it to send a signal, then when you slow the oil levels out and the sensor go's off. I've had this happen alot with a taurus that I owned. The simple solution was to top off the oil to the correct level and the sensor did not come on again (until it ran low again, had a leaky oil plug on oil pan).
Check that the oil level is full.If the oil has been in service for more than 4,000 miles, change it. Replace the oil pressure sending unit. If nothing changes, put a mechanical gauge on the engine and read actual oil pressure. Though "acceptable" low pressure is only 5lbs, I would never accept that as safe. Minimum pressure should be at least 20-25psi and normal running pressure between 35 to 45psi. How low is "slightly low"?
CHECK GAGES light (1) indicates a potential engine failure(low oil pressure, low coolant, coolant overheating) has occurred. · Check gages and shut down engine. Gages should read as follows: Oil pressure 5 to 10 psi (34 to 69 kPa) at idle; Water Temp gage below 230 degrees (110 C).
· Check engine oil level (Para 2-11) if OIL PRESS gage indicates low reading. Check coolant level (Para 2-11) if Water Temp gage indicates high reading. Notify Unit Maintenance if levels are low.
If CHECK ENGINE light (2) is on, check engine oil pressure gage (3) and water temperature gage (4). If both indicate normal, proceed with mission and then notify Unit Maintenance. If either one does not indicate normal, stop engine immediately and notify Unit Maintenance
Sounds like your oil level is too low.
When you slow down or stop, your oil levels out and is too low for the gauge to read.
When you speed up, your oil sloshes and splashes the sensor, thus making it appear that it is circulating properly, when it actually isn't.
I think I'd be real tempted to check connection at oil sender, for clean and tight, and if that doesn't help, for the price, I'd change it, but not knowing exactly which engine you have, I couldn't give you a ballpark on oil sender switch. You can look it up or call autozone, or similar for price.
Check the oil level. Back when I was 16 my car's oil light came on when turning corners. Turned out it was low on oil by about 3 quarts!!!
If the level is good then you probably have low oil pressure. Install a (mechanical) oil pressure gauge and compare that to what the reading is supposed to be (you can get that info from a service manual).