Temp & Gear Ratio

["Robert Wiseman" <robman@telocity.com>]

Well tonight I did investigating.

#1.  Temp Gauge/Sending Unit.
    When I turn on the ignition, the gauge jumps to 90.
    I have the same volts reading at the gauge and the sending unit
    Someone suggested that I remove the sending unit, suspend it in boiling
water and check the gauge.  No Change.
    Ran engine 15 min.  Drove around block several times.  No change in
gauge.

    Does this mean I need a new sending unit?

#2.  Trying to determine my gear ratio in the rear end.
    Jacked up one wheel, marked the drive shaft, and the wheel
    Turned wheel 1 rotation.
    Drive shaft turned not quite 2 rotations.
    Did the same with my spare rearend.  Same result.

    What does that tell me about my gear ratio.
    or should I have jacked up both wheels?

Thanks,
Rob