In dash cluster aftermarket tach replacement-69 Cuda rallye cluster

Pix above, bezel and housing are untouched. Only the blank off plug was modified to fit. This is why i will go this route for my sons car. The aftermarket "repop" ones look great, but the accuracy of them is pretty dismal. I got a blank off plug in his instrument cluster i plan on cutting to fit this, however a mount plate could be made from some thick aluminum plate, and the tach could be glued into it with JB weld. I think the guy i got the pix from stated this was a beat up cluster he used for mockup purposes.