How's everyone doing? New to the forum here and I've thought of every scenario for my problem so I'd look for some help.

I recently installed an ignition killswitch in my coupe, however, after a couple of launches it tends to cut in and out. I've fixed this issue, but when I get on it once in a while the speedometer will fluctuate, go down to zero, then come back and work again...it was doing this when my o2 sensor was blowing my battery fuze which I fixed, so I know that's straight. The gauges all went down when the battery fuze was blown. When the ignition switch was cutting in and out, everything went on and off but now, it's just the speedometer. The tach is good.

I'm thinking it's the VSS but I'm not sure...any input is appreciated!

 

have a look at the plugs the harness and VSS one, they can get corroded and wear to where it's just a few wires connecting.

 

yeah get some electrical connector cleaner at autozone disconnect the speed sensor and spray the cleaner inside see if that helps .

 

I'll try that and a replacement vss is only like $10 from autozone anyway.

But really, I didn't start having this issue until I really started practicing my launches so we'll go from there and see what happens. Appreciate it!