Dash lights

["1784T2Y4DY" <1784T2Y4DY@email.msn.com>]

Folks- I've been unable to get the lights in my tachometer and
speedometer to light. The wires are hot. I've replaced the bulbs. The
lights will burn in the sockets if I lay the wire end of the socket on
my battery's positive terminal and touch the socket holding the  bulb
to the negetive terminal. The fuel and temp lights are working fine.
I've also tried turning the brightness knob to both extremes with no
result. What am I missing? Thanks Tom