Please forgive my noobness. I searched and found some advice, but no solutions.
Here is what I have so far.
Vehicle:
1992 Jeep Wrangler with original 4 banger efi with 5 speed manual
Swap engine:
Blueprint Engines 355 1 piece rear seal. Forged crank/rods/pistons. Dart heads and a tpi friendly cam.
Fuel Injection:
GM TPI from a 1989 IROC. Painless wiring with a 1227730 ecm running speed density.
Plans:
Remove all original fuel injection related wiring from Jeep harness and replace with painless and keep as neat as possible. I would like to retain all GM TPI emissions so I can get through inspection. Also keep all original Jeep gauges working along with speedometer. Basically keep it as neat and factory looking as possible.
As far as I know, the stock gauges will work with the GM senders. Oil, water, and Volt that is. Speedometer is a different story.
VSS Problems:
As far as I can tell from searches is the original Jeep VSS is a 8 pulse sender of the "Hall Effect" type. The GM TPI is looking for a 4 pulse VSS AC signal, I think?
Possible Soultions:
1. Use and aftermarket ECM that will accept the 8 pulse "Hall Effect" VSS?
2. Find someone to burn me a custom PROM that will work with the 1227730 ecm to accept the 8 pulse "Hall Effect" VSS?
3. Find a complete aftermarket ECM setup to use the 8 pulse "Hall Effect" VSS?
4. In 1991, Jeep used a mechanical speedometer and a VSS. The sender for this year had the mechanical speedometer and electric vss in one unit. I think I can use the VSS part of the sender to run the original Jeep speedometer. Where the mechanical speedometer would normally hook up, I can use a Painless 4 pulse generator for the 1227730 ecm.
I hope this makes sense. Sorry if I have been rambling on, but I'm just trying to wrap my head around this one issue I have with figuring out the VSS issue.
If I had my way, I would like to have option 2. This way I can use as many oem parts and senders.
Thanks for reading.
Pat
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