I have installed a bmw fuel gauge on my 86 K100rt. Plugged it into the harness, nothing. Do I have to change to a different sending unit in the tank? How can I check to see if the gauge is ok? Or forget it and pack a couple gallons
Thanks
Kevin

If your tank hasn't got the float meter it won't work. The earlier bikes had a two level switch, not a float with a continuous signal which is needed for your gauge. It is my understanding that if the wireloom has a 4pronge connector for the additional instruments you have a loom that is set up for the fuel gauge. If the tank is fitted with the float meter................You'll have to have a look.

If you look in the tank with a float you can see the rather delicate looking float arm and float. it goes from 0 to 90 Ohms by the way and is back to front when compared to normal fuel senders so the gauge has to be the right way round if one wants to use a non BMW gauge.
Regards,
K-BIKE

It is a BMW gauge and as the stated from the person that I bought it from "it is 2" in dia., it has 4 wires in a orange plug, green, brown, yellow gray, it mounts in the fairing surround". It has the 4 prong connector, but not sure if there is any juice to it. There is a float on the sending unit. Thanks for the replies.

Renez,
Is it possible to fit the appropriate guage/switch into this tank. I have changed out the wiring harness and it has the correct connector, so I am guess I need a different float arm switch assembly?

Just found this on IBMWR:
K bike fuel level sensor
Float type(later) fuel tank sender, wiring harness Bought new has about 20,000 miles excellent condition $55
Price: $55 plus shipping
Location: Spring Hill, Fl.
Contact Will McDonald at <willwilly_52@msn.com>
Telephone 352 442 7978
Posted Tuesday, April 14, 2009 at 17:08:53 (EDT)

How's that for service! Good one!!

THANKS!! I have called and sent an email. Much appreciated! At least now I know what I need to look for. Again, Thanks
Kevin

Awesome job Bert! That's what I like about this site!!!

Thanks, Bert. the check will go in the mail Monday, he still HAD it
Kevin

Got it and it is quite different, hope thats a good thing. I'll be heading in this weekend, cover me. Thanks all for the help, will let you know how it goes.
KC

SUCCESS!!! Thanks to you Guys...Thank You Very Much
I now have a 1986 K100RT with an operational fuel gauge. Everything works! Could not and would not have done it without you.
Bert, ReneZ, K-Bike and all others that offer wisdom assistance and connections on this site, you are all appreciated.

THANK YOU
Kevin

Ah, great when things work out!!

And now have fun riding the thing!