71-74 Ralley Gauge question

[rgp266]

I have the following gauges that I purchased to convert my '73 RR from standard (non Tach) to a Tach cluster. Wondering if the numbers I pulled from the gauge face plates will ID them as to Year.
301078 2985221 N
301080 2985223 N
301073 2985214 N

Thanks
Bob

 

[Nacho-RT74]

Allong the years just speedo changed, due top miles mark and red to blue high beams indicator on 74. Rest of gauges didn't changed due the year.

Also vertical againts horizontal slot for the high beams indicator but in 73 I think.

Personally, never have noticed any difference with the rest of gauges. Dunno if somebody else have something else to say about.