CJ7 258 I6 Oil Gauge Going Crazy

[smrshl]

The oil pressure gauge on my new (to me) CJ7 goes crazy when the engine is running. It goes from 0 - pegged almost faster than you can see it. I'm thinking that it's either a short in the wire or a bad sender. Just wanted to see what you guys thought.

 

[XLarge]

Mine could be "steered" by the dimmer-switch of the lights...
While the gauge- lights were bright i had no oil-pressure. While dimming the light
The oil-pressure slowly increased.

The solution was (like almost always) a bad ground of the oil-pressure gauge.

Fixed that and everything was ok.

Hope this helps.

 

[mtnwhlr]

It sounds to me like the wire is shorting out somewhere.

 

[smrshl]

I'll take a closer look at it tonight and see if I can find the short.

 

[thistle3585]

I had that problem. The wires were backwards. As soon as I turned on the ignition, it would jump across. I eventually put a mechanical gauge on.

 

[XLarge]

Other thing i had was the fuel-gauge jumping fast to the full position immediately after ignition on.
Also (!) was a bad ground inside the speedometer gauge.
As i read in a famous post here about gauges: check your groud

 

[smrshl]

All the other gauges seem to work fine, fuel gauge is off by about 1/4 but it works.

 

[thistle3585]

My fuel gauge is off to and a lot of people have told me that the float leaks.

 

[smrshl]

Got the oil pressure gauge fixed. Turned out the wire coming off the sender was barely connected. Pulled it off and pinched the connector a little bit with my needle nose and voila, good as new.

 

[mtnwhlr]

Glad to hear you got it fixed and it was a easy fix