1980 c10 custom delux fuel gauge problem

[masric187]

so we were having problems switching over from lt to rt and the fuel gauge also was sometimes working and other times not....well found a blown fuse and got the switch to work and selector unit to work but now the fuel gauge goes to full and a little beyond when power is ON ...but when the key is pulled it gives a proper reading...(both tanks) .So does anyone know what is going on? Trying to help a friend
thanks

[VileZambonie]

I think we need to add this link to the technical pages:



here's the direct link so you can read it clearly

http://i6.photobucket.com/albums/y228/Sabaka454/fuelselector.gif