So update... I found a tach harness and just hope the consol wiring has the original female end to tie the tachometer lead into like factory or I’ll be doing more dreaded soldering... I believe I have the correct part numbers for the sending units now so cross our fingers there.
The power issue/battery drain looks like it’s because the interior power and chassis power had a fuse able link burned out between that and the alternator smfh... after searching all the wiring i stripped away some electrical tape to find that.
Doing some searching for a good soldering fun for think gauge wiring applications so any suggestions will be much appreciated.