Oil PSI light, H20 temp light?
I did the same thing for my dart....guage plus lights.
Here's the sender I used:
Oil Pressure Switch - W/ Light-440 Source
I used little LED flush mount bolt lights from here:
Flush Mount LED Bolt | Oznium They're bright at ****, so wired in a 3Kohm resister inline with them which reduced them perfectly. Flush, clean little lights. Above poster is correct....the sender is self grounding.