dodge dart rally dash questions

If you want a tach in the center of the cluster, this tach (Stewart Warner 82181 Sidewinder Tachometer) fits in the ralley dash center blank pod with a little effort from what i understand. runs about $150 on ebay and mimics the factory gauges pretty well and standard hook ups make it a no brainer when oem tachs in unknown cond. run a few hundred $$ and nos ones $800-$1000.
Your dash frame can be made to fit, but it takes plenty of work, tweeking & tuning. those that have done it, all state - "buy a ralley frame"..lol
another option is to find a ralley frame 67-71 and piece & patch (weld in the guage cut out as one piece. this is the route Im going, as I cant find a 70-71 frame thats not the cost of a 4yr college tuition, and afaik the pre-70 (barracuda) units have the incorrect glove box door and ignition switch location (on the dash)
Like you, I got parts & pieces accumulating, just waiting to get it all together and start my ralley dash build.