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I've had my autometer afr gauge hooked up for 3 to 4 years. And now when I turn the key it won't show the display. Could the gauge itself be bad? I've confirmed everything is wired correctly and the connections are clean.

So the only major change I made was to go from .067 pvcr to .078 pvcr. And now my plugs are darker. But afr's are a little more stable at cruise. 12.7-13.2 depending on throttle position. When I'm cruising I stab the throttle it jumps to 17.0 for about 3 seconds before it picks up. I did go from...

So at cruise I can stab the throttle I'll stay in it and it will flutter for about 3 seconds then it will catch up. Afr gauge will go up to 17.0 then when the carburetor catches up it will drop. So switching to the blue pump cam did help alot. I guess now I need to go bigger on the power valve jets.

I recently had my car dyno tuned. It runs alot cleaner, but still has a bad stumble. When cruising down the road I can stab the throttle and it will fall on its face. The carburetor is a modified 950 quick fuel/thumper carburetor. I've had everything from a 750 vacuum secondary carb to the 950...

Just wondering if anyone has changed the jaz sending unit in the fuel cell? I was told I can loosen the nuts and pull the sending unit out and the gasket and screws will stay in place.