The Speedhut fuel gauge doesn't really like the original Torana sender, it works but the reading can vary a lot. I suspect the old sender just can't hold consistent resistance any more (if it ever could), the original gauges would have smoothed that out a lot more. I've also never gotten around to altering the float arm for the taller drop tank, so it seemed like a good excuse to make some modifications.
Started by removing the sender unit and straightening out the pickup tube for more depth.
I'd kept the remains of an old VT setup after pilfering several bits from it, never throw anything away. These are the key pieces of the sender, needs a new mount because it was originally all part of the plastic pot.
Needed a small chunk of aluminium, but didn't have anything suitable. Fired up the furnace to solve that problem, then squared it up on the mill.
Machined the pivot on the lathe, there is a 2 degree taper to the main section of the hole and there's a threaded hole in the base.
The brass piece on the left is new, this also has a small taper in the opposite direction. The piece on the right is the original that now has a thread.
This was the best way I could think to reproduce the shape that the plastic arm rides on, trepanning it on the lathe wasn't an option given the size.
Back to the mill to create a slot for the little board.
Also a round slot on the back for mounting to the pickup tube.
Drill and tap some holes, add a stainless clamp. Removed some of the excess material so it's as easy as possible to get into the tank.
Made a new threaded electrical terminal.
The board is retained by the screws at top left and bottom right. The brass washer is soldered to the left terminal so that one is now earthed through the tube, I think I'll probably solder a terminal onto the tube on the outside of the tank to get a clean connection.
Tweaked the float arm to suit (I hope, final fine tuning probably required). Pressed on a fitting for a new filter sock.
![Image](https://img.v8comp.co.nz/Torana/20240526_161539.jpg)