First you need a sending unit,philips screwdriver.pliers(needle nose work great for this),some sort of cleaning solution, and a multimeter or somthing to see if you are making contact.
Now take meter and test to see if circuit is complete. I'm not real good with meter so I set it so it shows a short when there is a circuit and mine beeps.
Open so no contact. On the cover of sending there are three tabs. Take pliers and open them up.
In side you will see how when you move float there is a copper or brass arm that slides on copper winding. This is main parts to clean! (On one unit the copper slide wasn't making contact so had to bend it a little) so it was touching copper windings.
Be real carful as there is a small copper wire that transmitts from top if you break this its all over (thats why I only fixed 4 out of 5)
Now clean up the contacts on top of sending unit
After you get it all clean check if you have a curcit.
Ok now with case still open you will find a small screw. If your lucky it will turn. If Not take some P.B. Blaster or other brand and soak screw threads
This screw lets you move float setting. What I did (no pic sorry) was put 2&1/2 gallons of gas in tank and kept moving it till it was close. This can be done with cover off sending unit. When your happy with reading's put cover back on unit and install on tank. Mine all read closer than they did before but I still don't trust them whole heartedly. I still use mpg on trip odometer. Hope this helps and good luck.
