Putting a rallye panel in a standard dash can be done but... It aint easy. The bolt holes in the dash are in different locations. The harness connecters and wire locations are different.
One member told me he got a good deal on 2 rallye instrumnet panels on Craigs List. By the time he had it in his car he had over a thousand out of his pocket.
And that was with refurbished stock gauges.
