Would an instrument cluster swap from a 2.9L to a 4.0L?

[Fordtoughranger]

Curious if my instrument cluster from my 2.9L would swap directly in place of my 4.0L one without smoking anything?
4.0L sometimes squeaks and speedometer jumps sometimes, may just need greased, but figure if I take it apart I might as well swap it for one that wasn't acting up it possible.
Maybe some legal issues with doing this, but neither of the odometers are accurate due to bigger tires anyways.

Thanks
Fordtough

 

[Jessie_D_S]

I dont see a problem with this the only thing you will have to worry about is if one or the other doesnot have a tach... other wise should be innerchangeable

 

[MAKG]

Fix your speedometer. There is no excuse for that.

The oil gauges may be different, the connectors may or may not be, and tachs definitely will be. 4.0Ls have EDIS.

And if they don't LOOK the same, they aren't going to fit....if they DO look the same, swap the speedometer heads.

 

[fastpakr]

Hmm.. From something AllanD mentioned to me earlier in a PM, I thought the tach signal was provided by the TFI or EDIS system as an output to the cluster that already was adjusted for actual RPM rather than simple ignition events so that the same tach could be used on multiple engines. Maybe that did change from TFI over to EDIS, though.

 

[AllanD]

I'm still running my original unmodified 1987 tachometer on my 4.0 engine.

It required no modification of "converter module" or any such Bullshit
I just hooked up the proper tach signal wire from the wiring harness
to the 4.0 harness and the tach worked.

SO if my '87 tach works perfectly with my EDIS 4.0 engine I don't see
tach compatibility being an issue between tachs that are factory
installed in any later truck.

BTW, my brother's 1990 supercab (4.0 4x4) was factory "Tachless"
and I retrofitted a tach cluster into it.
It was long ago but it was a "plug and play" operation.

BTW, jittery speedo? MUCH more likely to be a bad speedo cable than a bad speedo.


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