I bought a Microtech MAF from Advance Auto that fits 86-89 TPI cars (165 ecm). It is the film type and I believe they make them for Wells also.

The output voltage for all airflows is 0.3 volts higher than the Bosch MAF. I made my own air flow bench and compared the two MAF's. This results in a very rich condition with the stock MAF tables.

Is there a way to alter what incoming voltage the ecm sees? Could I put a resistor on the MAF signal line to drop the voltage by 0.3? I have reprogrammed my ARAP bin by changing the MAF table scalar values then adjusting the tables but I wanted to know if there was another way to make it work.

I returned the first Microtech but the second gives the same readings so they are programmed that way from the factory.