Not sure if this is in the correct thread..
I know all my sensors are shot to hell right now and im in the slow process of replacing them. I was wondering what sensors are the biggest priority to replace first. cant buy them all at once dont have that much money right now. just the most important ones first.
Car is a 91 RS 305 TBI Automatic.

Coolant temperature sensor (CTS) and connector for it.

RBob.

What makes you say that "all of your sensors are shot to hell?"

after that, O2 would be a good one, especially with how cheap you can get one-wire O2s these days. i think i saw Densos at autozone for like ~$18?

Ok thanks ill get on those. and i know there all shot becuase everysingle one i looked at was corroded and falling apart. Guam moisture isnt nice to any parts of a car, and this ones been sitting for awhile.

Some sensors, like the coolant temperature, should be pretty easy to test with a multimeter. You'd just need to know what resistance value matches up to a known temperature. There's probably a chart somewhere.
If you can hook up to WinALDL, that will tell you what the sensors are doing so you know which are most in need to be replaced.
O2 is harder to test and very important, so that might be one I'd blindly replace.

ty for the tip armos. but i finally got ahold of an obd 1 sensor and there really was nothing working at all. My MAP sensor hookup was broken and the prevoius owner had just kinda of shoved the pins in the hole and made it looked alright. but when i took it off the metal pins fell out. so i have a new wiring coming too