So it would appear the high reading just started with the new sending unit. That would suggest it's the wrong one or it is defective. I just recently figured out mine was stuck reading 3/4 scale for I don't know how many years. I noticed it didn't budge when when I stopped the engine and turned the ignition switch back on.
Your gauge should go down to low if you unplug the sending unit. If it does not, that wire is grounding out.
Sunday, March 6th, 2011 AT 1:21 AM