Coolant or Oil Temp Gauge Recommendation

A few of us have some cheepos that replace the oil cap. I got one for around $15. But you can't see the temp when riding. I use the OEM cap anyway, unless I want to check the temperature from time to time.

Happen to have a link?
 
Happen to have a link?
The original seller is not listed on Ebay anymore.

But here is the one I have:

Or you can just do a search with this: Bikers Choice 71559S3 Oil Tank Dipstick

These fit the Rockets. BUT the hi-low markers are not the same as the original.
 
Thanks a bunch!
 
Will this fit the older rockets with the smaller diameter dip stick or the newer ones with the larger diameter? Not sure what yeah it changed.