Questions about RPM

[skyridr02]

Hello I am kinda new at this but here goes...I have a 79 240D 4spd with the 3.0 5 Cyl diesel from a 300D. I finally got a 4spd (240d) transmission installed and have been driving it... With out a tach I kinda of have to guess at the engine speed. It seems to me that it's turing some high rpms to be doing hwy speeds 55 and above...normal? I was on the hwy last weekend and the spd limit is 65, the car has no problem running that fast but sounds like it's really wound up...I hasitate to exceed 55 or 60 for fear it will overwind. Do these cars IP have governers to prevent engine overspeed? Any way to attach a tach? ....

Thanks in advance for any help.