Thomas, don't know all on the gasser gauge on the 86-89 revision; 90-91 revision. There are slight differences in the 126 for ea. of those time frames. I used a 1984? 380 SEL gauge section from the '81-85 time frame version of the 126. I have seen many others and the method (armature winding) and resistors of the fuel gauge part do look a little different on some of the newer ones, but I THINK they interchange.
PS: Hope you received (or should recieve soon) the parts info. I sent. Went out 2 days ago.
dculkin, Point well taken, but since my lines and switch over valve are pristine (tested and checked) I opted for the easiest to get to spot to add the parallel line since I am an inveterate "fiddler" and I throw a vinyl hose on the "gang" often.