My temp gauge jumps violently ***SPLIT From Oil Pressure***

[mluder]

Some of the gauges keep the needles where they were when you shut the car off and others don't. Temp and oil stay where they were for example and the tach does something else bizarre entirely. If you have the car off and put the key in and turn to accessories, does the needle go back to zero? And when the engine starts it goes back to full? Watch my video a few posts back to see what I mean.



hmmm. My temp guage jumps violently around when I shut off the car. Then again it doesn't always reset when I start the car either so I sometimes have to give a whack to the side of the binnacle and it will (usually) jump back into place. Obviously something wrong there.

Cheers.
Steven

[mluder]

Its normal for it to sit somewhere between 1000 and 2500, occasionally going higher. The needle is supposed to be perfectly balanced, and the actuator for the tach goes limp when powered off. Jumping to 5000 when turning off means that something in the tach's circuitry is spiking it the moment power is cut off. I wouldn't worry about it though as long as it reads properly when the engine is running. FYI, it will also read "fast" if the dash has low power due to a bad ground or bad connection or other, but you've checked most of that out now so I wouldn't worry about it.

That's interresting - My temp guage and votage guage are acting funny. NOt sure about my tach when I shut the car off but I do have a high idle - around 1000 rpms. I originally thought this was something wrong at the engine but now I'm suspecting it might just be the goround at the dash.

Have to check that out.

Cheers
Steve