Thirty years ago I was cursed for bolting a 1 wire gm alternated to my 1970 series 2 driver!
Now xks makes a complete kit all hardware included
For the real drivers out there,if you have a series 1 4.2
dont even bother making your own kit
its just wonderful!!!!!!!!
look at the results
only change instead of a shunt made of tin



i put a heavy duty wire because of the ameter
I cannot stress the upgrade
everything is bright and even
thank you xks
email if someone needs to convert
ps series 2 has a volt meter a moot point on the shunt

 

Better shot behind the gage
the red wire is the shunt