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If you don't have a lambda computer or k-jetronic ECU, than only get one if you need it to pass emissions.
The k-jetronic lambda ECU does nothing other than run the lambda emission system that uses a narrow band oxygen sensor in the exhaust to monitor oxygen level and a frequency valve / inline injector pulse valve on the fuel head that makes small changes in the fuel mixture to keep AFR's around 14.7:1 to pass emissions so they could sell the 930 in the USA again in 1986.
At full throttle the throttle position switch on the throttle body puts it into open loop mode and the AFR goes richer.
K-jetronic lambda control was calibrated with the better quality gasoline that was around in the mid eightees and not the low quality ~E10 stuff that has oxygen in the ethanol molecule we get from pump gas today. Today's E10 gas leans out the mixture a little because of that so it should run a little richer than the gas from the eightees to run as smooth.
Some people have removed everything electrical under the driver seat. The lambda computer or k-jetronic ECU, the enrichment relay that bypasses the lambda box at full throttle to richen the fuel mixture, and the speed relay rev limiter, and the wire harness that goes from it to the shock tower cross member in the engine compartment and the car runs great. It will be more reliable without the 25 year old relays and prehistoric lambda emission control devices that are on CIS.
When changing to EFI all that stuff is removed, and CIS doesn't need it either.
CIS is all mechanical and needs nothing more than around 97psi fuel pressure.
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