First drive issues

[Tommio RS]

Hello ZR-1 registry.

I has recently taken ownership of a nice 1995 ZR-1

Upon taken my 3rd or 2nd shakedown road test i have found a couple of issues. Test drive loop is 6kms and 15mins of driving.

1: The Speedo cuts in and out.
Upon driving around on my test loop the speedo worked fine.
Then about half way through my drive it just cut in and out.....Then out.
Then the CEL popped on....
I have pulled the codes doing the pin jump under the dash and found 2 codes:
C12 no issue
H24 Vehicle Speed Sensor
I think the connector is poor from my guess.
How does one find the VSS for diag?


2: The coolant temp seems high for my liking.
On the same test drive loop i was seeing temps of 96C at a stop.
When moving the temps would drop to around 88-92C.
The rad fans would NOT shut off at all really.....And when the CEL popped on i though the car was overheating and such. But i think not.
Here is why.

I touched the top rad hose and it was warm but not hot.
When i would squeeze the upper rad hose i could hear a hiss noise from the upper rad cap/ surge tank.
I removed the cap from the car when it was cold and found the caps seal to be junk!

https://photos.app.goo.gl/k2VchkbMMXtRVEPD7

I also performed a check to see if the cooling system had any air in it by,
removing the surge tank cap and running the motor to see if the vent tube to be streaming coolant into the surge tank and it was. O and the coolant is GREEN and looks very clear, NOT discolored!

So my best guess for the coolant being higher than normal and fast heating im hope is a poor rad cap because the car could NEVER build pressure.

Things that i KNOW are still possible:
Air lock
Plugged radiator
Cylinder head gaskets.....I hope not!

Thanks again.