How do I bypass instrument gauge dimmer and put on toggle switch

There are listings of auto bulbs and their wattage ratings, but I can tell you up front that a 168 bulb is higher wattage(brighter) than a 194.

That said, your issue is probably not the dimmer, so I wouldn't suggest hacking the wiring to make a workaround that probably won't improve things. It's likely a combination of dirt and too few bulbs as originally designed.

What I suggest is going the LED route. I buy a multi-pack of 168/194 wedge-base bulbs off eBay for less than $10 and free shipping. If you buy the 2-pack at the parts store they are a lot more expensive.

Things to remember are:
1. Most of those type LED bulbs require full voltage and won't dim down, so you will have all or nothing with the dimmer.
2. They usually only work one direction electrically, meaning if you put in a bulb and it doesn't work, take it out, turn it around and it'll work.

Personally I love LED's. The USA has consistently brought up the rear on lighting technology, but finally LED bulbs are gaining widespread acceptance.