The Journal of the Assembly credits John Bidwell and Frank M. Pixley with 1 vote each. The statewide abstract shows Bidwell with 3 votes: 1 in Alameda County and 2 in Inyo County. The abstract also mentions Pixley as having received 1 vote, but does not specify the county.
The Union nomination of George Gorham was controversial among Republicans in California. Republicans opposed to Gorham organized their own ticket headed by Caleb Fay.
Candidates party affiliations obtained from the 9/4/1867 Sacramento Daily Union. https://www.cdnc.ucr.edu/?a=d&d=SDU18670904
Source for Popular Vote data: California State Archives, "Governor," Abstract of the Votes polled at a General Election Held in the State of California on Wednesday the Fourth day of September A.D. 1867 (Sacramento, 1867)