I am currently doing a 1990 V8 with 4L60 (early type) transplant and I needed to run Vss direct to ECU. The number of different suggestions I have had are unreal ,all being different. The following web site answers all the problems for anyone wishing to transplant any GM V8 into
something else
V-8 Vehicle Speed Sensors (VSS), Speedometers, V8 Conversions, Stealth Conversions

http://www.jagsthatrun.com/V8-chapte...ed-Sensors.pdf

Hope this helps someone as I have been days trying to get info on this