YouTube - bed and wire ?

 

I don't think you can use an 87 sending unit with an 80-86 gauge.

 

idk at this point i have to hook it up and try i called star he said it will work

 

The 87 sending unit will plug in to the 86 wiring harness, but the gauge in the cab will read backwords, ie when the float is up the gauge will read empty. At least that was the case when I tryed to use a sending unit from a 89 in my 85.

 

i will try it but i got the wireing for the 87 so how know inteill i try can con just get a new gauge cheaper them a new sending unit in my area

 

So would reversing the leads that feed the signal into the gauge fix that?

 

dave a 89 would be 7.3 the 87 sending unit came out a 6.9 so i think they should work cause i know the 7.3 have a driftrent gauge but i think the 6.9 was the same

 

When I checked the two sending units with an ohm meter, they were backwords. I don't remember which was which, but one read the high ohm when the float was in the full position, and the other read high ohms in the empty position.

 

all you gotta do is hold the sending unit in your hand, plug it in and plug the front plug to the harness.... turn your key on and move the float by hand. take 5 minutes to see exactly whats up.