rpm gauge stopped working

[GT40Mustang]

rpm gauge stopped working in my 1986 mustang gt.. and i cant figure out why all the other gauges work fine, are their any fuses or wiring i could check ?

 

[363Coupe]

http://www.veryuseful.com/mustang/tech/engine/images/mustang-87-93_Instrument-Cluster.gif



and anything else you may need to know!!!

http://newyorkmustangs.com/forums/mustang-engine-fuel-injection-and-eec-information-t6638.html