Thread: Flathead dual temp sender-good idea?

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Originally Posted by oldbuick

When I bought the digital gauges for my car I asked the manufacturer if I could put a temp sensor in the trans and one in the motor and use a toggle switch to switch between the 2. I was told no, unless I put in a VERY expensive special low restance switch, because the gauge wouldn't read correctly. I guess paul274854 has found otherwise.

Yes I did find otherwise

Why not have 2 needle pointers in the same gauge working off the same pivot point like clock hands? Red for the Right head, Lime green for the Left head?

Originally Posted by Lord Antagonism

Why not have 2 needle pointers in the same gauge working off the same pivot point like clock hands? Red for the Right head, Lime green for the Left head?

Looked at it, just can't make a business case for it.

heres my idea.. use 1 single gauge, an adjustable temp warning light setup and 2 real senders, a special relay ( can't think of the type/ name ) that will switch off 1 power source when another is switched on, and otherwise work just like a normal relay.. this way, if your 'second side' starts getting hot enough to turn your adjustable warning light setup on, that circuit will close the relay and it will switch senders, so ither way, it can be seen if it is getting hot

I made an electronic circuit for my dual sender single gauge temperature monitor that is switch selectable for the side that connects to the gauge, and the other side is then connected to a circuit that will flash a warning light when its sender sees an over temp. The circuit needs to be calibrated to the senders so it takes some fussing with to install; but it duplicates the original Ford circuit with the added advantage of being able to select which side is the primary source.

Originally Posted by BillM

I made an electronic circuit for my dual sender single gauge temperature monitor that is switch selectable for the side that connects to the gauge, and the other side is then connected to a circuit that will flash a warning light when its sender sees an over temp. The circuit needs to be calibrated to the senders so it takes some fussing with to install; but it duplicates the original Ford circuit with the added advantage of being able to select which side is the primary source.

This is the same as option 2, where we use a standard sender and a warning contact on the other side, just like the original, later ford flatheads had. The gauge reads one side and pegs when the other overheats
Mark