why is there still no OBD control module for external relays?

[MegaMagneticStang]

so for years i have been searching and waiting for someone / company to make a device that simply plugs into your OBD port and control external devices via some kind of phone or laptop software that programs the box.

for example, you want to build your own shift light. you wouldnt have to screw with finding tach signal wires and tearing into your wiring looms on your new car. you could even program the shift light based on gear because you could use vehicle speed and vary the light depending on those factors.

if you wanted an electronic exhaust dump, you could program it to open / close based on RPM and or WOT. you could use it as a nitrous switch as well. or have multiple outputs for various externally controlled gadgets all based on RPM, WOT, vehicle speed, ect.

having a neat little "plug and play" box would be so much nicer than having to screw with switches, or buy module after module only to have to cut into data lines on you car, guessing and hoping you have the right splice.

I dont suppose anyone has found such a magical device online have they?! if so, please save me some annoyance and link me to it! Thanks!
(in the meantime, i guess im going to have to look up ELM to arduino / raspberry pi stuff)...

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[Schwerin]

It depends on the car and the ECU. Even my 2000 Escort had a hidden shift light that in the ECU using SCT I could toggle on and set the RPM(just not per gear). Then I just had to plug a bulb into the blank space.

Lots of that stuff probably IS viable in something like the SCT ProRace Package, but you need least 1K, a laptop and to know what you are doing. On top of the rhe ECU supporting it. I don't think there is much money in someone looking for just those features then trying to figure out how to make a box JUST to change those.