lynnmor 7,321 #1 Posted November 8, 2020 I replaced my faulty sending unit with a Dorman 55818 in a 520H. The resistance specs are slightly different, but the unit can be used as is. By filing a small amount off the stops, I was able to fine tune the sending unit to the gauge. Be sure to look inside the tank and check for clearance between the float and the petcock screen, you might have to tweak the float arm just a bit. I made short pigtails with the proper ends to complete the wiring 5 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,070 #2 Posted November 8, 2020 Good post. Copied your info to here Garry 3 Share this post Link to post Share on other sites
cleat 6,098 #3 Posted October 1 On 11/8/2020 at 9:34 AM, lynnmor said: I replaced my faulty sending unit with a Dorman 55818 in a 520H. The resistance specs are slightly different, but the unit can be used as is. By filing a small amount off the stops, I was able to fine tune the sending unit to the gauge. Be sure to look inside the tank and check for clearance between the float and the petcock screen, you might have to tweak the float arm just a bit. I made short pigtails with the proper ends to complete the wiring Did the sending unit holes all line up to the tank top mount ? Thank you. 1 Share this post Link to post Share on other sites
