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Posted

there is a bad connection with the fuel gauge that will make it peg out. the Tach should work probably a bad connection there too. When i swaped my cluster for gauges everything worked except for the oil preasure gauge that i havent got around to fixing yet.

Posted

Shouldn't need to do anything special in order for the tach to work, didn't need to on my '88.

 

I would remove the guage cluster and clean all the tab contacts on the backside with an eraser or small piece of fine emery cloth.

Posted
there is a bad connection with the fuel gauge that will make it peg out. the Tach should work probably a bad connection there too. When i swaped my cluster for gauges everything worked except for the oil preasure gauge that i havent got around to fixing yet.

 

you might check the sending unit... they are in a prime position (on the 4.0) to get whacked and stuff while changing oil filters. and they tend to fail anyways. i know i knocked my moms completely loose last time i changed her oil.

Posted

The fuel gauge should work properly when swapping gauges for idiot lights. However, both the temperature sender and the oil pressure sender have to be replaced. The ones for the idiot light cluster are not sensors, they are simple on-off switches. The ones for the gauges are variable resistors.

 

The tach should also work with no modifications or external connections.

Posted

Here are some pics to better clarify what Eagle just explained to you.

 

Here is the OIL SENDER:

 

 

Here is the TEMP SENDER:

 

 

DO NOT TOUCH THIS ONE!!!

 

 

Good luck,

CW

Posted

thanks guys i already changed the tempsensor and will take the oil pressure sensor off my parts xj. the tach may work, i suppose ill need to get the truck running to figure that out for sure

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