No start, huge tach bounce

[944Nick]

I'm currently posting this in a parking lot, a little bit ways from home. I drove my 88 944S a few miles to the store and no it won't start. I'm somewhat familiar with no start conditions and I've replaced my reference sensor a couple times. I recently replaced it with a non-bosch one because I had to do some janky wiring to the harness and I decided to properly fix it.
The thing is this time I have tach bounce, except it randomly bounces up to 1k rpm and floats back down. Any urgent help is appreciated
Thanks,
Nick

[huskerick1]

Have you checked the DME relay?

[TibetanT]

Hello there:

Is the battery fully charged? When was the last complete service done?

[944Nick]

I swit he'd the DME relay with a spare one I keep in the fuse box and I changed the battery, spark plugs, oil, and had to put in some used junkyard injectors a couple weeks ago

[944Nick]

Well I came back to try to test the reference sensor and it started first try so that's wack