[DeTomaso] Speed Calculation

[Myron Zadony]

I have my speedometer removed & sent out to Palo Alto Speedometer for repair.  I am going on a short trip of about 130mi all Interstate highways I need to know what RPM will equal to the MPH.  I have a 1974 L pretty much stock.  Rear tires are:  Pirelli P7 285/50 VR 15.  I need to know what 60MPH is, 65MPH is in RPM's ??  Any help would be appriciated.  Thanks, Myron (the other guy in Cleveland) #6928 74 L.