I'm not wrenching, but in a continual state of "deciding".
I had recounted in detail my experience per my Trooper and a Repair Shop of Horrors and its Mechanic from Hell back in summer 2019. The guy did two or three successive levels of damage in an assignment to replace my Trooper's valve cover gaskets. He broke the ports on my heater-core, deceptively looping the engine cooling ports with a single hose. Then, to fix that under repair warranty, he blew the fuse to my window-wiper-washer system, broke the connection to my steering-wheel horn switches, left a coolant leak at a small hose connecting engine cooling jacket and the intake manifold or common-chamber. About that time, I began to notice the icon-idiot-light on the dashboard going on too frequently, which is a little gas-station fuel pump and hose to indicate that the gas tank is almost bone dry.. Everything else about the instrument cluster is working properly.
So for a couple years, I kept worrying about the fuel-delivery system. Why was that idiot-light going on too often, when the gas-tank was between 1/2 and Full? The regular gas gauge works fine.
I found another solid-gold repair-shop and mechanic, but they couldn't explain the idiot-light; they only assured me -- to the point of losing patience with my suggestions -- that my fuel delivery system, the pump, the fuel-pressure switch -- all of it -- was working great. Then, they retired. I found another solid-gold repair-shop and mechanic, and this time they had a mechanic who was veteran of an Isuzu dealership. He knows his stuff.
So I asked them, offering to pay for reading my e-mail and "consultation". In October, I'll be running the car into their shop for routine air-conditioning inspection and a vent-cleaning operation they say will increase the flow of cold air in the passenger compartment.
Service advisor consulted with the Isuzu mechanic. He reported back that it is probably a loose connection at the instrument cluster on the dashboard, and nothing more than that. With the Repair Shop of Horrors, I'd fixed my lack of a horn with a rocker switch on the dash and a connection circumventing the steering wheel to the horn-relay. Scars of battle, I call it.
Right away, the service advisor suggested that I just put a piece of electrical tape over the idiot light. As long as the regular gas gauge works, the idiot-light serves little purpose anyway. But I suggested the possibility that they might eventually pull the dashboard, fix the idiot light, fix the steering-wheel horn-switch connection, and even replace the old light-bulbs in the instrument cluster.
I explained to the service advisor about my wiring job for an in-dash MP3 player, a dual-QC-USB (rocker-switch-design) and the rocker switch which turns it on and off, with my own understanding -- and his -- that aftermarket installations pose problems to mechanics. If I go through with it, I will have to check every aspect of my wiring job to make sure nothing will get pulled loose when they pull the dashboard.
So I'm thinking. This car is 25 years old. Everything else is working fine. The engine at 192,000 miles almost seems to run better than it might have after 30,000. Maybe I have to practice my quick-draw routine for hitting the horn switch on the left-side of the dash near the steering-wheel, but it isn't really a major concern in my satisfaction with the old Trooper.
I've got a right to spend my money and save my money as I see fit, and I love this old car despite the 14 mpg gas-mileage (slightly worse with the AC running).
I can't yet make up my mind as to what I should do, and doing nothing is a viable option. I might even do the thing with the electrical tape. But if I choose to have the repair-shop and their veteran Isuzu mechanic do the work, I may have to fiddle with my DIY wiring and hope that they don't leave me with additional DIY repairs which -- of course -- they wouldn't be responsible for.
So -- not wrenching. Just weighing pros and cons for deciding . . . I'm just glad I have a repair shop that offers honest information with advice to cover an idiot-light with tape because the fuel-empty indicator is sort of like a person's appendix. It's almost an unnecessary and vestigial feature of the car. Maybe if I buy my EV eventually, I can worry more about the Trooper just as a sort of hobby..