Coolant gauge issue

Wilson2608

Hello all, as always, thanks for any input. It really helps alot to get advice from fellow Z owners when fixing my car.

To make a long story short, I had a gas gauge problem. After figuring out my fuel pump housing was broken in half, I decided to jerry rig something up until CJM makes a billet top one.(pictured) It works great, and all the weight is not hanging on the electrical wires which is really all i wanted to fix( temporary). I had to make the housing shorter in order to fir in the tank.

Now im having issues, I have a fuel sending unit high input and fuel temp sensor high input engine codes. Im thinking it has something to do with my jerry rig. (this issue isnt my biggest concern as of now, ill wait to see if a properly made one fixes that issue) but any input would be appreciated on this matter as well.

The main problem, my coolant gauge is reading low constantly. The gauge worked fine until I did my jerry rig job on the fuel pump hosuing, but how does have anything to do with coolant? I'm going to ensure the theromostat is working properly after work today. Heres the weird part, when im driving the car, it reads 100% as low as possible, but when the engine is off, and just the electricty is on (engine not running) the gauge works fine.

Any help please

Attached Images

IMG_2655 (1).jpg (106.8 KB, 25 views)

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.