Questions about hud clusters

[NAVY-ET]

is there a difference between hud clusters?

how can you tell?

or is it just in the wiring harness thats different?

how can i tell which one mine is ?

nissan lists the cluster 89-94 all models, there is no listing dif. between single cam and dual except the harnes.
but i keep hearing that the clusters are physically different.
thanks for any help

[S13Silvia917]

if im understanding your question correctly...the difference is in the redline, the 89-90's have a lower redline thatn the ones for dual cams

[silver350z05rb]

dont the rpm tachs read differently between single and dual?