[elhigh]

Unless you added EFI to it, I know that 1980 Toyota PU is only going to be measured tank-to-tank.

I have looked into analog fuel computers. They're spendy and you usually have to add a flow meter to them for instantaneous feedback. For that I just recommend a vacuum gauge.

I don't think the OBD1 protocols are the same as the OBDII, so even constructing a wiring adapter still wouldn't serve your purposes to hooking anything up to it, not anything that was expecting to read OBDII. In that instance I reckon the customizability of the MPGuino is your friend, you can make it talk to pretty much anything with an engine computer.