1970 Ralley Dash Voltage regulator?

Rally dash (oil pressure) IVR is inside the fuel gauge. This is evidenced by THREE studs on the fuel gauge. If you google this you may not find your exact year but the idea is the same...disconnect the internal regulator guts, which is somewhat delicate, and then feed a conventional IVR INTO the 5V stud on the fuel gauge. This is normally the OUTPUT of the IVR coming "out" of the fuel gauge to the other gauges.