Welcome Kevin,

Change / replace the temp gauge senders & thermostat instead, the coolant
temperature is a direct precise indication of the head / water jacket temp.
I find that the Vanagon gauge is very precise when working properly.

I would suggest that you add an oil temp & pressure gauge instead of a
heads VDO.

The oil temp and pressure VDO / monitoring is a very good addition to
detect any upcoming engine problems. (Including the infamous 2.1 long term
rod problem)
See the following link on that subject:
http://volksweb.relitech.com/21rodbrg.htm

I am still trying to figure out which one to buy (oil VDO) for the vanagon.
Here is a good link (new VW parts supplier in Canada):
http://store.cip1.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=cali&Cat
egory_Code=20-05

If any of you guys have more info on the subject!!!!!!! (parts #, parts
supplier)

Regards, Ben
http://www3.sympatico.ca/huotx/engine1.htm