Here's my attempt at deciphering the temp. senders for 1st gen Camaro with pics.
The list includes L6 and V8, with and without gauges. I hope the pics are at least representative.
Permission to use these pics on this forum has been sought and granted by all the owners - credit is given with the respective pics.
Here's a list of part numbers from April '70 PnA grp 1.150V8 with gauges
67 - 1513321
68 - 6400759
69 - 1513462V8 without gauges
67 and 69 - 1993369 see note 1
68 - 1993426L6
67 1st design - 1993369 see note 2
67 2nd design - 1993409 see note 2
68 and 69 - 1993427 brown or red top
Note 1. The group has an entry '66 - 69 Chevy, Chevelle, Camaro [8 cyl.] [exc. gauges]' but also has a specific entry for 68 which reads 'All [8 cyl.] [exc. inst. panel gauges] which has a different part number.
This variation in 68 versus 67 and 69 is also noted in the AIM's
Note 2. According to the PnA, the 1st design was stamped 369. It had a temp rating of 248 degrees.
The 2nd design was ink stamped 409 and a date code. It had a temp rating of 253 degrees.
Here are the pics of the senders/switches, in the same order as the above list.V8 with gauges67 - 1513321
Picture courtesy of ebay user tillyfour68 - 6400759
A crop of a generic sender from 68Zproject's pic69 - 1513462
Picture courtesy of ebay user raider0007V8 without gauges67 and 69 - 1993369
Pictures courtesy of ebay user claysparts68 - 1993426
1st and 2nd pictures courtesy of ebay user gtonly
This picture courtesy of ebay user alongthelinegaL667 1st design - 1993369
- see V8 without gauges67 2nd design - 1993409
Picture courtesy of ebay user dcparts68 and 69 - 1993427
Pictures courtesy of ebay user nomad3
Let me know if you spot any errors.