Well I have a 89 chevy 1500 that has a 700r4 in it, but it has the electronic speedometer. I can pick up a runing 700r4 with the manual speedo for 100 bucks. now my question is, is there any way to get that speedo to work on my truck since it now has the cable driven speedo?

 

autometer has this that says it will turn a manual speedo into a electronic one. but it says it will work for there gauges...will it work on the factory harness too??

 

....anyone??