Yes, they do. I used one on the '51 GMC I had for the fuel gauge. I used an aftermarket Stuart-Warner mechanical temp. gauge. Picked up the resistor from The Filling Station. It worked and had good directions for installing.........but it did get hot while operating.
The device I was trying to remember..........
The Runtz!! Ask Fithave about it.........email or PM him........there were threads about it in the past; but it was quite a while ago and probably not in the archives here.
I believe it will operate both of your gauges.
