All three of my 77's have the floor temp indicator in the dash. Only two of them have the emblem that states it was catalytic equiped. None of the lights have ever come on. None of them have the altitude sensor that I am aware of. Don't know if they even have a bulb behind them but am betting they probably all came with the indicator as a matter of production line ease. No reason to believe any of them were actually sold in CA. Two of them almost certainly were pacific northwest cars. Haven't traced the third car back to original owner but records available show it to have been serviced with very low miles here in Idaho. Who knows I guess. I wish it wasn't there (the light) if it doesn't function, but it is and so be it...........

Leonard

Maybe you can hook a switch into the sensor relay to turn on the light manually, and change the indicator to say TURBO

I did something to that effect with my Dodge Dart 340 Sport. I hooked up a simple contact switch to the carb so that when the four barrels opened the "Fasten Seatbelt" light lit up. Way cool when you are 18!