300SD stubborn RPM gauge

[cho]

When swapping from my donor 300sd, the instrument table was not working
at all,... (I have electronic speedo) and after some repairs done by me I manage
to get oil gauge/odo and speed working,..but rpm is still out of function (clock is fine LOL) ... as to my knowledge I can not put any other than exact one, namely form another 300sd...right ?

anyways,... how hard is to find one complete working instrument table (the one with 120mph if possible,..mine is 80mph) in US and what is expected prize?



edit: does anyone have a pic of rpm amplifier? mentioned as ; amplifier on the fender.... also I don't have a red box in fuse box.....