Ok, your wording is a bit odd, a "TBI system" is more than just the TBI and with the order of what you listed it sounded like you mounted the ECM on the intake...
I've used the Painless VSS (2000 PPM model) with great success in the past with the '7747. It it screws into the trans, and allows the speedo cable to be screwed on to it. Painless also makes a 4000 PPM model for TPI type ECMs, make sure you get the right one for your application. ;)
IIRC you could get the VSS from Jags That Run for less than getting it through Painless, even though they seem to be the same unit. I believe there was another brand that worked as well, but I don't recall what that brand was off hand.
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