help me find an electrical gremlin, please

latest update:

Went through the ECU tshooting guide posted by 67dart273.

with key in run pos...pins 2 and 3 (pin 1 not used) were within 1v of battery.

with key in off...ohms on 4 and 5 was .303 with mm set at 2k ohms so that would be a little outside the 300-550 range...got .303 at the pickup connector too

with one lead at the pick up coil and other lead grounded...got no reading

here is where it gets hoaky. With key in off...and lead on a good ground...got no reading when I probed pin 5 same for pin 4.

gonna run a ground wire from ECU to the body and see if that fixes it...if not, based on the tshooting guide, the ECU needs to be replaced. Am I tracking????

thx
Steve