I'd like to get it fixed before I go riding again

 

mmm

 

I looked in my 1999 mach z and formula III (600/700/800) shop manual and heres what it says on the gauges:

False fuel and temperature gauge readings

1. Verify if gauge was connected on DC current by mistake(in case of optional installation).

a. Faulty installation of optional equipment
Find optional wires connected directly to DC ground (BK wire to chassis) or to any DC hot wire (RD RD/BL). Disconnect and reconnect to AC current (YL and YL/BK wires)

2. Verify sender unit for free movement and/or correct arm position

a. defective or damaged part

3. Verify sender unit/gauge wiring harness condition

a. Heating, rotating or sharp part in contact with harness.


I'm not sure what they mean by the sender unit but maybe its the temperature sensor. It' s located on the back of the engine adjacent to the brake rotor and it screws into the engine block. It probably has a connector plug attached to it. I'm not a sled repair guy, but thought this may help.

 

Did you :whatever: check your reservoir for anti-freeze make sure it 's at proper level,may have a vapour lock?

 

yes its at the same level since last spring...

 

Over the last 4 years my brother has replaced the temp gauge in his 97 Formula III twice and I have replaced the one in my MXZ once.They were working fine in the spring and when we got them out in the fall they didn't work.I asked on this forum last winter if anyone else was having trouble with these gauges but nobody else seems to be.I'd bet its the gauge but by all means check it the wiring and sender.I got one from the wreckers for $50 bucks.