I am doing a carb swap and I removed the ecm and all related wires. I still have the wiring harness that comes out the drivers side (has starter and sensor wires on it) are all my gauges going to work? As far as I can tell the oil, temp, volt, and fuel are ecm independant right? the tach will obviously need wired to my new distributor, but what about the speedo?

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1987 Formula 350, headman hedders, Accel supercoil, cap, rotor.
MAF screens removed. 160 degree stat and manual fan switch.

Best ET: 14.745@91.317mph-Stock
Best ET: 14.418@95.51 mph-Modded
Ridiculed Founder of the Traction Impaired Crew

 

Yes, most of them will work the same as before. Don't you have a speedometer cable to run your speedo? you would see it coming through the firewall right behind the speedometer.
You should have nothing to worry about.
ODB

 

no, I have an electronic speedo..

 

have to try it and see. If not then a good speedo shop or cruise-control installer will hook you up with what you need.

 

The speed buffer is a separate (yellow) box from the ECM. If you keep the speed buffer connected & remove the ECM, the speedo should continue to work.

Tim