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The temp sending unit may be shorted to ground. Unplug the sending unit to see if the gauge drops to cold. If it does, you have a faulty temp sending unit.
You need to get a manual oil pressure gauge that reads LBS. per squire inch so you can read what the oil pressure is for sure. Then remove the oil sending unit from the engine and screew the oil pressure gauge in it's place and start the engine and read what it says. I would give you the oil pressure SPECS. and tell you where the sending unit is, but you did not say what year are engine size and what it is in.
The 1995 Ford F3 50 temperature gauge sending unit can be found on the top of the engine. The temperature gauge sending unit will be near the middle of the intake manifold.
To hook up an oil pressure gauge on a Chrysler 318 engine, locate the oil pressure sending unit, which is typically found on the engine block near the oil filter. Remove the existing sending unit and install the gauge's sending unit or an adapter if necessary. Ensure that all connections are tight to prevent leaks, and then connect the gauge to the sending unit. Finally, check the gauge for proper operation after starting the engine.
To read a compression gauge, first ensure engine is warm and spark plugs are removed. Connect the gauge to a spark plug hole, then crank the engine a few times and note the reading on the gauge. Compare the reading to the manufacturer's specifications for your engine to determine if the compression is within a healthy range.
A faulty temp sending unit can do that.
either that or the gauge, wiring or a connector.
The temp sending unit or gauge is bad, probably the sending unit.
Take the wire loose from the oil sending unit and then turn the key on and ground the wire to the engine somewhere and the gauge in the truck should go all the way past the highest point. If it don't then the gauge in the dash is bad are the wire going to it ( The 1 you grounded ) is broken. If the gauge is reading low oil pressure, Then unscreew the oil sending unit on the engine just behind the distributor, were you took the wire loose from. Then install a OIL PRESSURE GAUGE into it's place. Then start the engine and read the pressure, Now compare the reading on the dash gauge to what you are reading on the oil gauge.
If you problem is that the gauge shows oil pressure with the engine off, you have a gauge or sending unit failure.
The fuel gauge on a 1985 Chevy Silverado will read full all the time if the sending unit is defective or the wire has come loose. When the tank is full, the sending unit normally shuts off which cause the gauge to read full.
Yes you can. You will need a oil pressure gauge to do it. You will need to remove the oil sending unit that's back behind the distributor and screew the oil gauge line in it's place and then start the engine and read the gauge. You should have no less then 20LBS at an idle.