littleredcorvette88

Does anyone know if I install a FAST system in my car will my digital dash and tach still work as well as the gauges? the car is a 91 and I have heard that all the dash runs thru the ccm? which is separate from the ecm? I just want to be sure my dash will work before I purchase the fast system

Thanks!!

beerme

Great question, I was just thinking about the same thing with my 87. I don't have the answer but I am eagerly awaiting some insightful knowledge to be shared.

5abivt

Im running the DFI Gen7. Everything works except the mpg calculator. All analogue gages are wired up.. speedo etc . Only thing I get is a sys flashng every few seconds which doesnt bother me at all. My factory ecu and wiring harness was completely removed from the engine compartment. I have a 93.

littleredcorvette88

So did the Gen 7 come with connectors to hook up in order for thesensors to work or is this just another harness that goes to the ccm? that you never disconected? I want to run the fast system but I dont want to lose my digital dash or tach etc. HMMMMM

LoneStarV

Sounds like it might be a nightmare to make that system work. Holley has a new throttle body injection system out as well that is all one package and self learning called the Terminator. I have electronic climate control on mine. I have no idea how the current computer system interacts with everything...then there's the digital dash as well.

ch@0s

My suggestion if you add another ECU weather its an ls swap or just an ECU swap is to keep your OEM PCM. Use the other only for engine management.

littleredcorvette88

yes that whats I was planning on doing.....just keep my stock ecm installed and then install the fast system plugging in only the connectors that are on the fast system and removing them from the ecm harness as I go. So leaving everything plugged in to the stock ecm except injectors, temp sensors, tps, map sensor etc. I'm just afraid of losing the digital dash...seems like if you dont have 5k to spend your screwed

littleredcorvette88

....Did you have to make the connections to the wiring that makes the speedo etc work or was the kit just plug and play? just trying to figure out what wiring exactly goes back to the speedo and was trying to get away using the fast system and not spending $3,000. It seems like no one really knows anything about the wiring on this forum.

thanks!!