Swap to cluster with mechanical speedo, mech oil pressure and voltmeter from Mech speedo, electric oil pressure and ammeter. Not sure of what year the new (to me) gauge cluster. A lot of wires to transfer and some changed position, some added, some not used. Results: Speedometer works. No longer bounces, but now reads about 10 MPH fast. Old one bounced and read 15 MPH slow. Voltmeter works. Oil pressure not hooked up yet. I have sender and it is wired ready for sender. Temperature gauge is weird. Reads high. Are there more than one sending unit. Blinker indicator lights work. Hi beam not working Gas gauge accurate when stopped, but bounces while driving. Probably loos connection somewhere. Old one worked fine. Brake warning light not tested. Worked correctly on old cluster. Gauge illumination not tested. QUESTIONS: Why big swing on speedo readings? Are there different temp sending units? Any help appreciated.