I know this has been beaten to death, but I still haven't found a concrete answer.

When swapping a COMPLETE 90-92 dash with gauges, what is needed to be swapped or converted?

Someone said that VATS comes into play somewhere...

How do the gauges (in terms of hookup and control) differ from the 82-89? I understand the speedo is electronically controlled rather than cable driven on the 90-92, correct? Anything else?

Has anyone done this complete swap?

 

NE one?

 

I've done it a few times, i like to leave no evidence of the install for the most part so i used 90-92 engine harnesses as well as the entire 90-92 dash and chassis harness, its easiest to leave the harness attached to the dash and pull it out as one part, be forewarned 90 91 and 92 all use different tail light harnesses and 90 is different for 91/92 on the chassis harness as it has the old plug for the tail lamps so it may work with 89 and prior but i havent tried it. some of them have both wires for a clutch switch and auto shifter, some just auto, not sure if there are any just clutch.

If you do the complete swap with matching dash and column you will have no vats issues.

The speedometer is electric, the tbi cars use a buffer box in the dash that the signal from the trans goes to and it spits 4000 pulse / mile at the computer and 2000 mile at the cruise box, V8 tpi and V6 cars had this built into the ecm.

 

Thanks for the info. The dash is coming out of a 91 V6. It doesn't have any of the wiring AFAIK. Will this be a supremely hard swap?

 

Well it seems that now you'll be using your existing chassis harness, so you may have to do some work as far as the connectors for the gauges, you DO know the mounts at the end are completely different also right ?

 

Yeah, although I read somewhere that the bolts at the top are strong enough to hold it in place. If needed, is it possible to fab up a bracket or something to hold the new dash in?

 

Each one i've done I drilled out the spot welds on both sets of mounts then installed the new style mounts in the car using 3M panel bond or pop rivets. Works great.